Unicode character property

The Unicode Standard assigngs various properties to each Unicode character and code point.^[1]^[2]^:Name

The properties can be used to handle characters (code points) in processes, like in line-breaking, script direction right-to-left or applying controls. Some "character properties" are also defined for code points that have no character assigned, and code points that are labeled like "<not a character>". The character properties are described in Standard Annex #44.^[2]

Properties have levels of forcefulness: normative, informative, contributory, or provisional. For simplicity of specification, a character property can be assigned by specifying a continuous range of code points that have the same property.^{[citation needed]}

Semantic elements[]

Properties are displayed^[where?] in the following order:

[code];[name];[gc];[cc];[bc];[decomposition];;;[nv];[bm];[alias];;;;

'alias' = corrected name
'bc' = bidi (bidirectional) category [L, R etc]
'bm' = bidi mirrored [N or Y]
'cc' = combining class [position of diacritic]
decomposition = letter + diacritic, ligature X Y, superscript X, font X, initial X, medial X, final X, isolated X, vertical X, etc.
'gc' = general category [letter, symbol, digit, punctuation, case behavior, etc.]
'nv' = numeric value [of a digit]

Name[]

A Unicode character is assigned a unique Name (na).^[1] The name is composed of uppercase letters A–Z, digits 0–9, - (hyphen-minus) and <space>. Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed. The name is guaranteed to be unique within Unicode, and can be used to identify a code point and its character. Ideographic characters, of which there are tens of thousands, are named in the pattern "cjk unified ideograph-hhhh". For example, U+4E00 一 CJK UNIFIED IDEOGRAPH-4E00. Formatting characters are named too: U+00A0 NO-BREAK SPACE.

The following classes of code point do not have a Name (na=""): Controls (General Category: Cc), Private use (Co), Surrogate (Cs), Non-characters (Cn) and Reserved (Cn). They may be referenced, informally, by a generic or specific meta-name, called "Code Point Labels": <control>, <control-0088>, <reserved>, <noncharacter-hhhh>, <private-use-hhhh>, <surrogate>. Since these labels contain <>-brackets, they can never appear as a Name, which prevents confusion.

Version 1.0 names[]

In version 2.0 of Unicode, many names were changed. From then on the rule "a name will never change" came into effect, including the strict (normative) use of alias names. Disused version 1.0-names were moved to the property Alias, to provide some backward compatibility.

Character name alias[]

Starting from Unicode version 2.0, the published name for a code point will never change. Therefore, in the event of a character name being misspelled or if the character name is completely wrong or seriously misleading, a formal Character Name Alias may be assigned to the character, and this alias may be used by applications instead of the actual defective character name.^[1] For example, U+FE18 ︘ PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET has the character name alias "PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRACKET" in order to mitigate the misspelling of "bracket" as "brakcet" in the actual character name; U+A015 ꀕ YI SYLLABLE WU has the character name alias "YI SYLLABLE ITERATION MARK" because contrary to the character name it does not have a fixed syllabic value.

In addition to character name aliases which are corrections to defective character names, some characters are assigned aliases which are alternative names or abbreviations. Five types of character name aliases are defined in the Unicode Standard:

Correction: corrections for misspelled or seriously incorrect character names;
Control: ISO 6429 names for C0 and C1 control functions (which are not assigned character names in the Unicode Standard);
Alternate: alternative names for some format characters (only U+FEFF "ZERO WIDTH NO-BREAK SPACE" which has the alias "BYTE ORDER MARK");
Figment: Documented labels for some C1 control code functions which are not actual names in any standard;
Abbreviation: Abbreviations or acronyms for control codes, format characters, spaces, and variation selectors.

All formal character name aliases follow the rules for permissible character names, and are guaranteed to be unique within both the character name alias and the character name namespaces (for this reason, the ISO 6429 name "BELL" is not defined as an alias for U+0007 because U+1F514 is named "BELL").^[1]

As of Unicode version 12.1, twenty-eight formal character name aliases are defined as corrections for defective character names.^[3] These are listed below.

Apart from these normative names, informal names may be shown in the Unicode code charts. These are other commonly used names for a character, and need not be restricted to letters A–Z, digits 0–9, - (hyphen-minus) and <space>. These informal names are not guaranteed to be unique, and may be changed or removed in later versions of the standard.

General Category[]

Each code point is assigned a value for General Category. This is one of the character properties that are also defined for unassigned code points, and code points that are defined "not a character".

hideGeneral Category (Unicode Character Property)^[a] v t
Value	Category Major, minor	Basic type^[b]	Character assigned^[b]	Count (as of 13.0)	Remarks

L, Letter; LC, Cased Letter (Lu, Ll, and Lt only)^[c]
Lu	Letter, uppercase	Graphic	Character	1,791
Ll	Letter, lowercase	Graphic	Character	2,155
Lt	Letter, titlecase	Graphic	Character	31	Ligatures containing uppercase followed by lowercase letters (e.g., ǅ, ǈ, ǋ, and ǲ)
Lm	Letter, modifier	Graphic	Character	260	A modifier letter
Lo	Letter, other	Graphic	Character	127,004	An ideograph or a letter in a unicase alphabet
M, Mark
Mn	Mark, nonspacing	Graphic	Character	1,839
Mc	Mark, spacing combining	Graphic	Character	443
Me	Mark, enclosing	Graphic	Character	13
N, Number
Nd	Number, decimal digit	Graphic	Character	650	All these, and only these, have Numeric Type = De^[d]
Nl	Number, letter	Graphic	Character	236	Numerals composed of letters or letterlike symbols (e.g., Roman numerals)
No	Number, other	Graphic	Character	895	E.g., vulgar fractions, superscript and subscript digits
P, Punctuation
Pc	Punctuation, connector	Graphic	Character	10	Includes "_" underscore
Pd	Punctuation, dash	Graphic	Character	25	Includes several hyphen characters
Ps	Punctuation, open	Graphic	Character	75	Opening bracket characters
Pe	Punctuation, close	Graphic	Character	73	Closing bracket characters
Pi	Punctuation, initial quote	Graphic	Character	12	Opening quotation mark. Does not include the ASCII "neutral" quotation mark. May behave like Ps or Pe depending on usage
Pf	Punctuation, final quote	Graphic	Character	10	Closing quotation mark. May behave like Ps or Pe depending on usage
Po	Punctuation, other	Graphic	Character	593
S, Symbol
Sm	Symbol, math	Graphic	Character	948	Mathematical symbols (e.g., +, −, =, ×, ÷, √, ∊, ≠). Does not include parentheses and brackets, which are in categories Ps and Pe. Also does not include !, *, -, or /, which despite frequent use as mathematical operators, are primarily considered to be "punctuation".
Sc	Symbol, currency	Graphic	Character	62	Currency symbols
Sk	Symbol, modifier	Graphic	Character	123
So	Symbol, other	Graphic	Character	6,431
Z, Separator
Zs	Separator, space	Graphic	Character	17	Includes the space, but not TAB, CR, or LF, which are Cc
Zl	Separator, line	Format	Character	1	Only U+2028 LINE SEPARATOR (LSEP)
Zp	Separator, paragraph	Format	Character	1	Only U+2029 PARAGRAPH SEPARATOR (PSEP)
C, Other
Cc	Other, control	Control	Character	65 (will never change)^[d]	No name,^[e] <control>
Cf	Other, format	Format	Character	161	Includes the soft hyphen, joining control characters (zwnj and zwj), control characters to support bi-directional text, and language tag characters
Cs	Other, surrogate	Surrogate	Not (only used in UTF-16)	2,048 (will never change)^[d]	No name,^[e] <surrogate>
Co	Other, private use	Private-use	Character (but no interpretation specified)	137,468 total (will never change)^[d] (6,400 in BMP, 131,068 in Planes 15–16)	No name,^[e] <private-use>
Cn	Other, not assigned	Noncharacter	Not	66 (will never change)^[d]	No name,^[e] <noncharacter>
Cn	Other, not assigned	Reserved	Not	830,606	No name,^[e] <reserved>
^ "Table 4-4: General Category" (PDF). The Unicode Standard. Unicode Consortium. March 2020. ^ Jump up to: ^a ^b "Table 2-3: Types of code points" (PDF). The Unicode Standard. Unicode Consortium. March 2020. ^ "5.7.1 General Category Values". UTR #44: Unicode Character Database. Unicode Consortium. 2020-03-04. ^ Jump up to: ^a ^b ^c ^d ^e Unicode Character Encoding Stability Policies: Property Value Stability Stability policy: Some gc groups will never change. gc=Nd corresponds with Numeric Type=De (decimal). ^ Jump up to: ^a ^b ^c ^d ^e "Table 4-9: Construction of Code Point Labels" (PDF). The Unicode Standard. Unicode Consortium. March 2020. A Code Point Label may be used to identify a nameless code point. E.g. <control-hhhh>, <control-0088>. The Name remains blank, which can prevent inadvertently replacing, in documentation, a Control Name with a true Control code. Unicode also uses <not a character> for <noncharacter>.

Punctuation[]

Characters have separate properties to denote they are a punctuation character. The properties all have a Yes/No values: Dash, Quotation_Mark, Sentence_Terminal, Terminal_Punctuation.

Whitespace[]

Whitespace is a commonly used concept for a typographic effect. Basically it covers invisible characters that have a spacing effect in rendered text. It includes spaces, tabs, and new line formatting controls. In Unicode, such a character has the property set "WSpace=yes". In version 13.0, there are 25 whitespace characters.

show v t Unicode characters with property White_Space=yes^[a]^[b]
Name	Code point		Width box	May break?	In IDN?	Script	Block	General category	Notes
character tabulation	U+0009	9		Yes	No	Common	Basic Latin	Other, control	HT, Horizontal Tab. HTML/XML named entity: `&Tab;`, LaTeX: '\tab'
line feed	U+000A	10	Is a line-break			Common	Basic Latin	Other, control	LF, Line feed. HTML/XML named entity: `&NewLine;`
line tabulation	U+000B	11	Is a line-break			Common	Basic Latin	Other, control	VT, Vertical Tab
form feed	U+000C	12	Is a line-break			Common	Basic Latin	Other, control	FF, Form feed
carriage return	U+000D	13	Is a line-break			Common	Basic Latin	Other, control	CR, Carriage return
space	U+0020	32		Yes	No	Common	Basic Latin	Separator, space	Most common (normal ASCII space)
next line	U+0085	133	Is a line-break			Common	Latin-1 Supplement	Other, control	NEL, Next line
no-break space	U+00A0	160		No	No	Common	Latin-1 Supplement	Separator, space	Non-breaking space: identical to U+0020, but not a point at which a line may be broken. HTML/XML named entity: ` `, LaTeX: '\ '
ogham space mark	U+1680	5760		Yes	No	Ogham	Ogham	Separator, space	Used for interword separation in Ogham text. Normally a vertical line in vertical text or a horizontal line in horizontal text, but may also be a blank space in "stemless" fonts. Requires an Ogham font.
en quad	U+2000	8192		Yes	No	Common	General Punctuation	Separator, space	Width of one en. U+2002 is canonically equivalent to this character; U+2002 is preferred.
em quad	U+2001	8193		Yes	No	Common	General Punctuation	Separator, space	Also known as "mutton quad". Width of one em. U+2003 is canonically equivalent to this character; U+2003 is preferred.
en space	U+2002	8194		Yes	No	Common	General Punctuation	Separator, space	Also known as "nut". Width of one en. U+2000 En Quad is canonically equivalent to this character; U+2002 is preferred. HTML/XML named entity: `&ensp;`, LaTeX: '\enspace'
em space	U+2003	8195		Yes	No	Common	General Punctuation	Separator, space	Also known as "mutton". Width of one em. U+2001 Em Quad is canonically equivalent to this character; U+2003 is preferred. HTML/XML named entity: `&emsp;`, LaTeX: '\quad'
three-per-em space	U+2004	8196		Yes	No	Common	General Punctuation	Separator, space	Also known as "thick space". One third of an em wide. HTML/XML named entity: `&emsp13;`
four-per-em space	U+2005	8197		Yes	No	Common	General Punctuation	Separator, space	Also known as "mid space". One fourth of an em wide. HTML/XML named entity: `&emsp14;`
six-per-em space	U+2006	8198		Yes	No	Common	General Punctuation	Separator, space	One sixth of an em wide. In computer typography, sometimes equated to U+2009.
figure space	U+2007	8199		No	No	Common	General Punctuation	Separator, space	Figure space. In fonts with monospaced digits, equal to the width of one digit. HTML/XML named entity: `&numsp;`
punctuation space	U+2008	8200		Yes	No	Common	General Punctuation	Separator, space	As wide as the narrow punctuation in a font, i.e. the advance width of the period or comma.^[4] HTML/XML named entity: `&puncsp;`
thin space	U+2009	8201		Yes	No	Common	General Punctuation	Separator, space	Thin space; one-fifth (sometimes one-sixth) of an em wide. Recommended for use as a thousands separator for measures made with SI units. Unlike U+2002 to U+2008, its width may get adjusted in typesetting.^[5] HTML/XML named entity: ` `; LaTeX: '\,'
hair space	U+200A	8202		Yes	No	Common	General Punctuation	Separator, space	Thinner than a thin space. HTML/XML named entity: `&hairsp;` (does not work in all browsers)
line separator	U+2028	8232	Is a line-break			Common	General Punctuation	Separator, line
paragraph separator	U+2029	8233	Is a line-break			Common	General Punctuation	Separator, paragraph
narrow no-break space	U+202F	8239		No	No	Common	General Punctuation	Separator, space	Narrow no-break space. Similar in function to U+00A0 No-Break Space. When used with Mongolian, its width is usually one third of the normal space; in other context, its width sometimes resembles that of the Thin Space (U+2009).
medium mathematical space	U+205F	8287		Yes	No	Common	General Punctuation	Separator, space	MMSP. Used in mathematical formulae. Four-eighteenths of an em.^[6] In mathematical typography, the widths of spaces are usually given in integral multiples of an eighteenth of an em, and 4/18 em may be used in several situations, for example between the a and the + and between the + and the b in the expression a + b.^[7] HTML/XML named entity: ` `
ideographic space	U+3000	12288		Yes	No	Common	CJK Symbols and Punctuation	Separator, space	As wide as a CJK character cell (fullwidth). Used, for example, in tai tou.

show v t Related Unicode characters property White_Space=no
Name	Code point		Width box	May break?	In IDN?	Script	Block	General category	Notes
mongolian vowel separator	U+180E	6158	᠎	Yes	No	Mongolian	Mongolian	Other, Format	MVS. A narrow space character, used in Mongolian to cause the final two characters of a word to take on different shapes.^[8] It is no longer classified as space character (i.e. in Zs category) in Unicode 6.3.0, even though it was in previous versions of the standard.
zero width space	U+200B	8203		Yes	No	?	General Punctuation	Other, Format	ZWSP, zero-width space. Used to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing. It is similar to the soft hyphen, with the difference that the latter is used to indicate syllable boundaries, and should display a visible hyphen when the line breaks at it. HTML/XML named entity: `&ZeroWidthSpace;`^[9]^[c]
zero width non-joiner	U+200C	8204	‌	Yes	Context-dependent^[14]	?	General Punctuation	Other, Format	ZWNJ, zero-width non-joiner. When placed between two characters that would otherwise be connected, a ZWNJ causes them to be printed in their final and initial forms, respectively. HTML/XML named entity: `&zwnj;`
zero width joiner	U+200D	8205	‍	Yes	Context-dependent^[15]	?	General Punctuation	Other, Format	ZWJ, zero-width joiner. When placed between two characters that would otherwise not be connected, a ZWJ causes them to be printed in their connected forms. Can also be used to display joining forms in isolation. Depending on whether a ligature or conjunct is expected by default, can either induce (as in emoji and in Sinhala) or suppress (as in Devanagari) substitution with a single glyph, whilst still permitting use of individual joining forms (unlike ZWNJ). HTML/XML named entity: `&zwj;`
word joiner	U+2060	8288	⁠	No	No	?	General Punctuation	Other, Format	WJ, word joiner. Similar to U+200B, but not a point at which a line may be broken. HTML/XML named entity: `&NoBreak;`
zero width non-breaking space	U+FEFF	65279		No	No	?	Arabic Presentation Forms-B	Other, Format	Zero-width non-breaking space. Used primarily as a Byte Order Mark. Use as an indication of non-breaking is deprecated as of Unicode 3.2; see U+2060 instead.

^ White_Space is a binary Unicode property.^[16] ^ "Unicode 13.0 UCD: PropList.txt". 2019-11-27. Retrieved 2020-03-12. ^ Although `&ZeroWidthSpace;` is one HTML5 named entity for U+200B, the additional names `NegativeMediumSpace`, `NegativeThickSpace`, `NegativeThinSpace` and `NegativeVeryThinSpace` (which are names used in the Wolfram Language for negative-advance spaces, which it maps to the Private Use Area)^[10]^[11]^[12]^[13] are also defined by HTML5 as aliases for U+200B (e.g. `&NegativeMediumSpace;`).^[9]

Other general characteristics[]

Ideographic, alphabetic, noncharacter.

Combining class[]

Some common codes:

0 = spacing letter, symbol or modifier (e.g. a, (, ʰ)

1 = overlay

6 = Han reading (CJK diacritic reading marks)

7 = nukta (diacritic nukta in Brahmic scripts)

8 = kana voicing marks

9 = virama

10–199 = various fixed-position classes

Marks which attach to the base letter:

200 = attached at bottom left

202 = attached directly below (e.g. cedilla on ç)

204 = attached at bottom right

208 = attached to left

210 = attached to right

212 = attached to top left

214 = attached directly above

216 = attached at top right

Marks which do not attach to the base letter:

218 = bottom left

220 = directly below (e.g. ring on n̥)

222 = below right

224 = left

226 = right

228 = above left

230 = above (e.g. acute accent on á)

232 = above right

233 = double below (subtends two bases)

234 = double above (extends two bases)

240 = iota subscript (only that Greek diacritic)

Display-related properties[]

Shaping, width.

Bidirectional writing[]

Six character properties pertain to bi-directional writing: Bidi_Class, Bidi_Control, Bidi_Mirrored, Bidi_Mirroring_Glyph, Bidi_Paired_Bracket and Bidi_Paired_Bracket_Type.

One of Unicode's major features is support of bi-directional (Bidi) text display right-to-left (R-to-L) and left-to-right (L-to-R). The Unicode Bidirectional Algorithm UAX9^[17] describes the process of presenting text with altering script directions. For example, it enables a Hebrew quote in an English text. The Bidi_Character_Type marks a character's behaviour in directional writing. To override a direction, Unicode has defined special formatting control characters (Bidi-Controls). These characters can enforce a direction, and by definition only affect bi-directional writing.

Each code point has a property called Bidi_Class. It defines its behaviour in a bidirectional text as interpreted by the algorithm:

show

Bidirectional character type (Unicode character property Bidi_Class)^[1]

hideType^[2]	Description	Strength	Directionality	General scope	Bidi_Control character^[3]
L	Left-to-Right	Strong	L-to-R	Most alphabetic and syllabic characters, Chinese characters, non-European or non-Arabic digits, LRM character, ...	U+200E LEFT-TO-RIGHT MARK (LRM)
R	Right-to-Left	Strong	R-to-L	Adlam, Hebrew, Mandaic, Mende Kikakui, N'Ko, Samaritan, ancient scripts like Kharoshthi and Nabataean, RLM character, ...	U+200F RIGHT-TO-LEFT MARK (RLM)
AL	Arabic Letter	Strong	R-to-L	Arabic, Hanifi Rohingya, Sogdian, Syriac, and Thaana alphabets, and most punctuation specific to those scripts, ALM character, ...	U+061C ARABIC LETTER MARK (ALM)
EN	European Number	Weak		European digits, Eastern Arabic-Indic digits, Coptic epact numbers, ...
ES	European Separator	Weak		plus sign, minus sign, ...
ET	European Number Terminator	Weak		degree sign, currency symbols, ...
AN	Arabic Number	Weak		Arabic-Indic digits, Arabic decimal and thousands separators, Rumi digits, Hanifi Rohingya digits, ...
CS	Common Number Separator	Weak		colon, comma, full stop, no-break space, ...
NSM	Nonspacing Mark	Weak		Characters in General Categories Mark, nonspacing, and Mark, enclosing (Mn, Me)
BN	Boundary Neutral	Weak		Default ignorables, non-characters, control characters other than those explicitly given other types
B	Paragraph Separator	Neutral		paragraph separator, appropriate Newline Functions, higher-level protocol paragraph determination
S	Segment Separator	Neutral		Tabs
WS	Whitespace	Neutral		space, figure space, line separator, form feed, General Punctuation block spaces (smaller set than the Unicode whitespace list)
ON	Other Neutrals	Neutral		All other characters, including object replacement character
LRE	Left-to-Right Embedding	Explicit	L-to-R	LRE character only	U+202A LEFT-TO-RIGHT EMBEDDING (LRE)
LRO	Left-to-Right Override	Explicit	L-to-R	LRO character only	U+202D LEFT-TO-RIGHT OVERRIDE (LRO)
RLE	Right-to-Left Embedding	Explicit	R-to-L	RLE character only	U+202B RIGHT-TO-LEFT EMBEDDING (RLE)
RLO	Right-to-Left Override	Explicit	R-to-L	RLO character only	U+202E RIGHT-TO-LEFT OVERRIDE (RLO)
PDF	Pop Directional Format	Explicit		PDF character only	U+202C POP DIRECTIONAL FORMATTING (PDF)
LRI	Left-to-Right Isolate	Explicit	L-to-R	LRI character only	U+2066 LEFT-TO-RIGHT ISOLATE (LRI)
RLI	Right-to-Left Isolate	Explicit	R-to-L	RLI character only	U+2067 RIGHT-TO-LEFT ISOLATE (RLI)
FSI	First Strong Isolate	Explicit		FSI character only	U+2068 FIRST STRONG ISOLATE (FSI)
PDI	Pop Directional Isolate	Explicit		PDI character only	U+2069 POP DIRECTIONAL ISOLATE (PDI)
Notes 1.^ Unicode Bidirectional Algorithm (UAX#9), As of Unicode version 12.0 2.^ Possible Bidirectional character types for character property: Bidi_Class or 'type' 3.^ Bidi_Control characters: Twelve Bidi_Control formatting characters are defined. They are invisible, and have no effect apart from directionality. Nine of them have a unique, overruling BiDi-type that is used by the algorithm. Their type is also their acronym (e.g. character 'LRE' has BiDi type 'LRE').

In normal situations, the algorithm can determine the direction of a text by this character property. To control more complex Bidi situations, e.g. when an English text has a Hebrew quote, extra options are added to Unicode. Twelve characters have the property Bidi_Control=Yes: ALM, FSI, LRE, LRI, LRM, LRO, PDF, PDI, RLE, RLI, RLM and RLO as named in the table. These are invisible formatting control characters, only used by the algorithm and with no effect outside of bidirectional formatting.^[17] Despite the name, they are formatting characters, not control characters, and have General category "Other, format (Cf)" in the Unicode definition.

Basically, the algorithm determines a sequence of characters with the same strong direction type (R-to-L or L-to-R), taking in account an overruling by the special Bidi-controls. Number strings (Weak types) are assigned a direction according to their strong environment, as are Neutral characters. Finally, the characters are displayed per a string's direction.

Two character properties are relevant to determining a mirror image of a glyph in bidirectional text: Bidi_Mirrored=Yes indicates that the glyph should be mirrored when written R-to-L. The property Bidi_Mirroring_Glyph=U+hhhh can then point to the mirrored character. For example, brackets "()" are mirrored this way. Shaping cursive scripts such as Arabic, and mirroring glyphs that have a direction, is not part of the algorithm.

Casing[]

The Case value is Normative in Unicode. It pertains to those scripts with uppercase (aka capital, majuscule) and the lowercase (aka small, minuscule) letters. Case-difference occurs in Adlam, Armenian, Cherokee, Coptic, Cyrillic, Deseret, Glagolitic, Greek, Khutsuri and Mkhedruli Georgian, Latin, Medefaidrin, Old Hungarian, Osage and Warang Citi scripts.

(upper, lower, title, folding—both simple and full)

Numeric values and types[]

Decimal[]

Characters are classified with a Numeric type.^[1] Characters such as fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits are type Numeric. They have a numeric value that can be decimal, including zero and negatives, or a vulgar fraction. If there is not such a value, as with most of the characters, the numeric type is "None".

The characters that do have a numeric value are separated in three groups: Decimal (De), Digit (Di) and Numeric (Nu, i.e. all other). "Decimal" means the character is a straight decimal digit. Only characters that are part of a contiguous encoded range 0..9 have numeric type Decimal. Other digits, like superscripts, have numeric type Digit. All numeric characters like fractions and Roman numerals end up with the type "Numeric". The intended effect is that a simple parser can use these decimal numeric values, without being distracted by say a numeric superscript or a fraction. Seventy-three CJK Ideographs that represent a number, including those used for accounting, are typed Numeric.

On the other hand, characters that could have a numeric value as a second meaning are still marked Numeric type "None", and have no numeric value (""). E.g. Latin letters can be used in paragraph numbering like "II.A.1.b", but the letters "I", "A" and "b" are not numeric (type "None") and have no numeric value.

show v t Numeric Type^[a]^[b] (Unicode character property)
Numeric type	Code	Has numeric value	Example	Remarks
Not numeric	`None`	No	A X (Latin) ! Д μ に	Numeric Value="NaN"
Decimal	`De`	Yes	0 1 9 ६ (Devanagari 6) ೬ (Kannada 6) WIKI

[fn1-4] "Table 4-4: General Category" (PDF). The Unicode Standard. Unicode Consortium. March 2020.

[fn2-5] Jump up to: ^a ^b "Table 2-3: Types of code points" (PDF). The Unicode Standard. Unicode Consortium. March 2020.

[fn5-6] "5.7.1 General Category Values". UTR #44: Unicode Character Database. Unicode Consortium. 2020-03-04.

[fn3-7] Jump up to: ^a ^b ^c ^d ^e Unicode Character Encoding Stability Policies: Property Value Stability Stability policy: Some gc groups will never change. gc=Nd corresponds with Numeric Type=De (decimal).

[fn4-8] Jump up to: ^a ^b ^c ^d ^e "Table 4-9: Construction of Code Point Labels" (PDF). The Unicode Standard. Unicode Consortium. March 2020. A Code Point Label may be used to identify a nameless code point. E.g. <control-hhhh>, <control-0088>. The Name remains blank, which can prevent inadvertently replacing, in documentation, a Control Name with a true Control code. Unicode also uses <not a character> for <noncharacter>.

[wsdef-9] White_Space is a binary Unicode property.^[16]

[ws-10] "Unicode 13.0 UCD: PropList.txt". 2019-11-27. Retrieved 2020-03-12.

[21] Although &ZeroWidthSpace; is one HTML5 named entity for U+200B, the additional names NegativeMediumSpace, NegativeThickSpace, NegativeThinSpace and NegativeVeryThinSpace (which are names used in the Wolfram Language for negative-advance spaces, which it maps to the Private Use Area)^[10]^[11]^[12]^[13] are also defined by HTML5 as aliases for U+200B (e.g. &NegativeMediumSpace;).^[9]

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[2]

[3]

[a]

[b]