Ideographic Description Characters (Unicode block)

Ideographic Description Characters
Range U+2FF0..U+2FFF
(16 code points)
Plane BMP
Scripts Common
Assigned 12 code points
Unused 4 reserved code points
Source standards GB 2312-80
Unicode version history
3.0 12 (+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 a 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)
 0123456789ABCDEF
U+2FFx ⿰ ⿱ ⿲ ⿳ ⿴ ⿵ ⿶ ⿷ ⿸ ⿹ ⿺ ⿻
Notes
1.^ As of Unicode version 11.0
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:

VersionFinal code points[lower-alpha 1]CountL2 IDWG2 IDIRG IDDocument
3.0U+2FF0..2FFB12L2/97-026N1494IRG proposal: Ideographic structure character, 1996-06-27
L2/97-114N1544Sato, T. K. (1997-04-08), Questions on the "Han structure method" described in WG2 N1490 (IRG N436)
N1680Project Sub-Division Proposal on Scheme of Ideograph Description Sequence, 1997-12-18
L2/98-286N1703Umamaheswaran, V. S.; Ksar, Mike (1998-07-02), "Ideograph Description Sequence", Unconfirmed Meeting Minutes, WG 2 Meeting #34, Redmond, WA, USA; 1998-03-16--20
L2/98-317N1892Combined CD registration and consideration ballot on WD for 10646-1/Amd. 28, AMENDMENT 28: Ideographic description characters, 1998-10-22
L2/99-072.1N1971Irish Comments on SC 2 N 3186, 1999-01-19
L2/99-072N1970Summary of Voting on SC 2 N 3186, PDAM ballot on WD for 10646-1/Amd. 28: Ideographic description characters, 1999-02-05
L2/99-120Text for FPDAM ballot of ISO/IEC 10646, Amd. 28 - Ideographic description characters, 1999-04-07
L2/99-253N2067Summary of Voting on SC 2 N 3312, ISO 10646-1/FPDAM 28 - Ideographic description characters, 1999-08-19
L2/99-301N2123Disposition of Comments Report on SC 2 N 3312, ISO/IEC 10646-1/FPDAM 28, AMENDMENT 28: Ideographic description characters, 1999-09-20
L2/99-302N2124Paterson, Bruce (1999-09-24), Revised Text for FDAM ballot of ISO/IEC 10646-1/FDAM 28, AMENDMENT 28: Ideographic description characters
L2/00-045Summary of FDAM voting: ISO 10646 Amd. 28: Ideographic description characters, 2000-01-31
L2/02-221N2480Cook, Richard (2002-05-18), Proposal to add Ideographic Description Characters (IDC) to the UCS
L2/02-436N2534N955IRG Radical Classification, 2002-11-21
L2/12-087Proposed Changes to ISO/IEC 10646 Annex I, Ideographic Description Characters, 2012-02-09
L2/15-065Jenkins, John (2015-02-02), Proposal to Add IDS Links to Online Unihan Database
L2/15-070Davis, Mark (2015-02-03), IDS in Unihan
L2/15-313Lunde, 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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