Ideographic Description Characters (Unicode block)

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Ideographic Description Characters
RangeU+2FF0..U+2FFF
(16 code points)
PlaneBMP
ScriptsCommon
Assigned12 code points
Unused4 reserved code points
Source standardsGB 2312-80
Unicode version history
3.0 (1999)12 (+12)
Chart
Code chart
Note: [1][2]

Ideographic Description Characters is a Unicode block containing graphic characters used for describing CJK ideographs. They are used in Ideographic Description Sequences (IDS) to provide a description of an ideograph, in terms of what other ideographs make it up and how they are laid out relative to one another.[3] An IDS provides the reader with a description of an ideograph that cannot be represented properly, usually because it is not encoded in Unicode; rendering systems are not intended to automatically compose the pieces into a complete ideograph, and the descriptions are not standardized.

Block[]

Ideographic Description Characters[1][2]
Official Unicode Consortium code chart (PDF)
  0 1 2 3 4 5 6 7 8 9 A B C D E F
U+2FFx ⿰ ⿱ ⿲ ⿳ ⿴ ⿵ ⿶ ⿷ ⿸ ⿹ ⿺ ⿻
Notes
1.^ As of Unicode version 14.0
2.^ Grey areas indicate non-assigned code points

History[]

The following Unicode-related documents record the purpose and process of defining specific characters in the Ideographic Description Characters block:

Version Final code points[a] Count UTC ID L2 ID WG2 ID IRG ID Document
3.0 U+2FF0..2FFB 12 X3L2/95-111 N1284 Ideographic Structure Symbol (additional request), 1995-11-07
N1303 (html, doc) Umamaheswaran, V. S.; Ksar, Mike (1996-01-26), "8.13 Ideographic structure symbols", Minutes of Meeting 29, Tokyo
N1348 Ideographic Components and Composition Scheme, 1996-02-05
N1357 Revised Ideographic Structure Symbols, 1996-04-12
N1353 Umamaheswaran, V. S.; Ksar, Mike (1996-06-25), "9", Draft minutes of WG2 Copenhagen Meeting # 30
L2/97-026 N1494 IRG proposal: Ideographic structure character, 1996-06-27
N1430 N365 Proposal Summary Form: Ideographic Structure Character, 1996-08-01
N1453 Ksar, Mike; Umamaheswaran, V. S. (1996-12-06), "9.6 Ideographic Structure Characters", WG 2 Minutes - Quebec Meeting 31
L2/97-023 N1486 N437 IRG #8 Resolutions, 1997-01-16
N1489 Supplement to Ideographic Components and Composition Schemes, 1997-01-16
N1490 N436 Response to WG2 question on Ideographic Structure Characters, 1997-01-16
L2/97-030 N1503 (pdf, doc) Umamaheswaran, V. S.; Ksar, Mike (1997-04-01), "9.6", Unconfirmed Minutes of WG 2 Meeting #32, Singapore; 1997-01-20--24
L2/97-114 N1544 (html, doc) N453 Sato, T. K. (1997-04-08), Questions on the "Han structure method" described in WG2 N1490 (IRG N436)
L2/97-255R Aliprand, Joan (1997-12-03), "4.B.2 Ideographic Structure Characters", Approved Minutes - UTC #73 & L2 #170 joint meeting, Palo Alto, CA - August 4-5, 1997
N1680 Project Sub-Division Proposal on Scheme of Ideograph Description Sequence, 1997-12-18
N1782 Clause X Ideographic Description Sequence (IDS) – IRG N575, 1998-05-06
L2/98-158 Aliprand, Joan; Winkler, Arnold (1998-05-26), "SC2 SC2 Action re Ideographic Description Sequences", Draft Minutes - UTC #76 & NCITS Subgroup L2 #173 joint meeting, Tredyffrin, Pennsylvania, April 20-22, 1998
N1842 Proposed text for a Draft for amendment 28 - Ideographic Description Sequences, 1998-06-03
L2/98-286 N1703 Umamaheswaran, V. S.; Ksar, Mike (1998-07-02), "9.5", Unconfirmed Meeting Minutes, WG 2 Meeting #34, Redmond, WA, USA; 1998-03-16--20, The original proposal was to use character composition. It has changed from being composition to description over its three year development.
L2/98-317 N1892 (pdf, doc) Combined CD registration and consideration ballot on WD for 10646-1/Amd. 28, AMENDMENT 28: Ideographic description characters, 1998-10-22
L2/99-010 N1903 (pdf, html, doc) Umamaheswaran, V. S. (1998-12-30), "10.3", Minutes of WG 2 meeting 35, London, U.K.; 1998-09-21--25
L2/99-072.1 N1971 Irish Comments on SC 2 N 3186, 1999-01-19
L2/99-072 N1970 (html, doc) Summary of Voting on SC 2 N 3186, PDAM ballot on WD for 10646-1/Amd. 28: Ideographic description characters, 1999-02-05
N2023 Paterson, Bruce (1999-04-06), FPDAM 28 Text - Ideographic Description Characters
L2/99-120 Text for FPDAM ballot of ISO/IEC 10646, Amd. 28 - Ideographic description characters, 1999-04-07
UTC/1999-014 Jenkins, John (1999-06-01), Recursion depth limit for IDC's
UTC/1999-015 Whistler, Ken (1999-06-01), Re: Brief note on length of ideograph descriptions
UTC/1999-020 Jenkins, John (1999-06-04), Diagram and language [for Ideograph Description Sequences]
L2/99-176R Moore, Lisa (1999-11-04), "Recursion Limit for Ideographic Description Characters", Minutes from the joint UTC/L2 meeting in Seattle, June 8-10, 1999
L2/99-232 N2003 Umamaheswaran, V. S. (1999-08-03), "6.1.2 PDAM28 - Ideographic Description Characters", Minutes of WG 2 meeting 36, Fukuoka, Japan, 1999-03-09--15
L2/99-253 N2067 Summary of Voting on SC 2 N 3312, ISO 10646-1/FPDAM 28 - Ideographic description characters, 1999-08-19
L2/99-301 N2123 Disposition of Comments Report on SC 2 N 3312, ISO/IEC 10646-1/FPDAM 28, AMENDMENT 28: Ideographic description characters, 1999-09-20
L2/99-302 N2124 Paterson, Bruce (1999-09-24), Revised Text for FDAM ballot of ISO/IEC 10646-1/FDAM 28, AMENDMENT 28: Ideographic description characters
L2/00-010 N2103 Umamaheswaran, V. S. (2000-01-05), "6.4.3", Minutes of WG 2 meeting 37, Copenhagen, Denmark: 1999-09-13--16
L2/00-045 Summary of FDAM voting: ISO 10646 Amd. 28: Ideographic description characters, 2000-01-31
L2/02-221 N2480 Cook, Richard (2002-05-18), Proposal to add Ideographic Description Characters (IDC) to the UCS
L2/02-436 N2534 N955 IRG Radical Classification, 2002-11-21
L2/12-087 Proposed Changes to ISO/IEC 10646 Annex I, Ideographic Description Characters, 2012-02-09
L2/12-007 Moore, Lisa (2012-02-14), "Consensus 130-C13", UTC #130 / L2 #227 Minutes, Submit L2/12-087 on extensions to ideographic description sequences to WG2.
L2/15-065 Jenkins, John (2015-02-02), Proposal to Add IDS Links to Online Unihan Database
L2/15-070 Davis, Mark (2015-02-03), IDS in Unihan
L2/15-313 Lunde, Ken (2015-11-03), Request for IDS Data
  1. ^ Proposed code points and characters names may differ from final code points and names

Ideographic Description Sequences[]

IDS := Ideographic | Radical | CJK_Stroke | Private Use | U+FF1F | IDS_BinaryOperator IDS IDS | IDS_TrinaryOperator IDS IDS IDS 
CJK_Stroke := U+31C0 | U+31C1 | ... | U+31E3 
IDS_BinaryOperator := U+2FF0 | U+2FF1 | U+2FF4 | U+2FF5 | U+2FF6 | U+2FF7 | U+2FF8 | U+2FF9 | U+2FFA | U+2FFB 
IDS_TrinaryOperator:= U+2FF2 | U+2FF3

See also[]

References[]

  1. ^ "Unicode character database". The Unicode Standard. Retrieved 2016-07-09.
  2. ^ "Enumerated Versions of The Unicode Standard". The Unicode Standard. Retrieved 2016-07-09.
  3. ^ IDS are described in chapter 18.2 of the Unicode Standard 9.0 on pages 689 through 692.
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