Ideographic Description Characters (Unicode block)

From HandWiki
Short description: Unicode character block
Ideographic Description Characters
RangeU+2FF0..U+2FFF
(16 code points)
PlaneBMP
ScriptsCommon
Assigned12 code points
Unused4 reserved code points
Source standardsGBK (U+2FF0–U+2FFB only)
Unicode version history
3.012 (+12)
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.

U+2FF0 to U+2FFB were introduced from GBK; U+2FFC to U+2FFF were devised later and introduced in Unicode 15.1 (2023).

Block

Ideographic Description Sequences

Ideographic Description Sequences are sequences of characters that represent a Chinese character structure as defined by the Unicode standard.

Below are the 16 characters as defined by Unicode in this block:

Unicode Char Meaning Example 1 IDS Example 2 IDS
U+2FF0 ⿰ Two components combined left to right 相 ⿰木目 𠁢 ⿰丨㇍
U+2FF1 ⿱ Two components combined above to below 杏 ⿱木口 𠚤 ⿱𠂊丶
U+2FF2 ⿲ Three components combined left to middle and right 衍 ⿲彳氵亍 𠂗 ⿲丿夕乚
U+2FF3 ⿳ Three components combined above to middle and below 京 ⿳亠口小 𠋑 ⿳亼目口
U+2FF4 ⿴ One component fully wrapping another component 回 ⿴囗口 𠀬 ⿴㐁人
U+2FF5 ⿵ One component surround three sides of another component (opening at bottom) 凰 ⿵几皇 𧓉 ⿵齊虫
U+2FF6 ⿶ One component surround three sides of another component (opening at top) 凶 ⿶凵㐅 义 ⿶乂丶
U+2FF7 ⿷ One component surround three sides of another component (opening at right) 匠 ⿷匚斤 𧆬 ⿷虎九
U+2FF8 ⿸ One component surround top and left side of another component 病 ⿸疒丙 𤆯 ⿸耂火
U+2FF9 ⿹ One component surround top and right side of another component 戒 ⿹戈廾 𢧌 ⿹或壬
U+2FFA ⿺ One component surround bottom and left side of another component 超 ⿺走召 𥘶 ⿺礼分
U+2FFB ⿻ Two components overlapped 巫 ⿻工从 𣏃 ⿻木⿻コ一
U+2FFC ⿼ One component surround three sides of another component (opening at left) 㕚 ⿼叉丶 𬺹 ⿼コ二
U+2FFD ⿽ One component surround bottom and right side of another component 氷 ⿽水丶 斗 ⿽⺀十
U+2FFE ⿾ Horizontal reflection 卐 ⿾卍 𣥄 ⿾正
U+2FFF ⿿ Rotation 𠕄 ⿿凹 𠄔 ⿿予

Two other related ideographic description characters are not encoded in this Unicode block, but of which may be used in ideogprahic description sequences:

Unicode Char Block Meaning Example 1 IDS Example 2 IDS
U+303E 〾 CJK Symbols and Punctuation Variant but not equivalent 㬵 (U+3B35) 〾胶 (U+80F6)[4] 𫜵 〾爫[5]
U+31EF ㇯ CJK Strokes Subtraction 乒 ㇯兵丶 𧰨 ㇯豕一


This is the syntax of IDS in EBNF: 

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

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[lower-alpha 1] 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), 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), 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), 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), 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), 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), 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), 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), 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), Minutes from the joint UTC/L2 meeting in Seattle, June 8-10, 1999 
L2/99-232 N2003 Umamaheswaran, V. S. (1999-08-03), 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), 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), 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 
L2/17-379 Lunde, Ken (2017-10-20), IRG #49 Liaison Report 
L2/18-012 Yang, Tao; Chan, Eiso; Wang, Yifan (2018-01-05), Proposal of Four IDCs 
L2/18-168 Anderson, Deborah; Whistler, Ken; Pournader, Roozbeh; Moore, Lisa; Liang, Hai; Chapman, Chris; Cook, Richard (2018-04-28), Recommendations to UTC #155 April-May 2018 on Script Proposals 
L2/21-118R N2492 Lunde, Ken; Jenkins, John H. (2021-08-11), Preliminary proposal to add a new provisional kIDS property (Unihan) 
L2/22-191 N2572 Lunde, Ken; Jenkins, John; West, Andrew (2022-08-24), Proposal to encode five new Ideographic Description Characters 
L2/22-227 SAT Feedback to "Preliminary proposal to add a new provisional kIDS property (Unihan)" (IRGN2492) and "Proposal to encode five new Ideographic Description Characters" (IRGN2572), 2022-08-29 
L2/22-228 Fan, Ming (2022-09-02), Feedback on IRGN2572 "Proposal to encode 5 new ideograph description characters" 
L2/22-247 Lunde, Ken (2022-11-01), CJK & Unihan Group Recommendations for UTC #173 Meeting 
L2/22-241 Constable, Peter (2022-11-09), Approved Minutes of UTC Meeting 173 
  1. ↑ Proposed code points and characters names may differ from final code points and names

See also

References

  1. ↑ "Unicode character database". The Unicode Standard. https://www.unicode.org/ucd/. 
  2. ↑ "Enumerated Versions of The Unicode Standard". The Unicode Standard. https://www.unicode.org/versions/enumeratedversions.html. 
  3. ↑ IDS are described in chapter 18.2 of the Unicode Standard 9.0 on pages 689 through 692.
  4. ↑ "「㬵（U+3B35）」和「胶（U+80F6）」为什么在《康熙字典》收录了两次？ - 知乎". https://www.zhihu.com/question/24871882. Retrieved 2023-09-21. 
  5. ↑ "基本集扩充字考（五・完结）附扩充块新增字考" (in zh). https://zhuanlan.zhihu.com/p/349694706. Retrieved 2023-09-21. 



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