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GB 12345,^[1] entitledCode of Chinese ideogram set for information interchange supplementary set (Chinese:信息交換用漢字編碼字符集　輔助集), is aTraditional Chinesecharacter set standard established byChina, and can be thought as the traditional counterpart ofGB 2312. It is used as an encoding of traditional Chinese characters, although it is not as commonly used asBig5. It has 6,866 characters, and has no relationship nor compatibility withBig5 andCNS 11643.

Characters in GB 12345 are arranged in a 94×94 grid (as inISO/IEC 2022), and the two-byte code point of each character is expressed in thequ-wei form, which specifies a row (qu 区) and the position of the character within the row (cell,wei 位).

The rows (numbered from 1 to 94) contain characters as follows:^[2]

• 01–09: identical toGB 2312, except in row 06 position 57–85, added 29 vertical punctuation forms, and in row 08 position 27–32, added 6pinyin characters from GB 5007.1–85, the correction of GB 2312.
• 16–87: arranged the traditional character forms which replaced their simplified forms from GB 2312.
• 88–89: 103Chinese characters which is merged due to the simplification of Chinese characters.

The rows 10–15 and 90–94 are unassigned.

The specification for theISO-2022-CN-EXT encoding states that the sequenceESC $ ) followed by a yet-undetermined byte (shown by the placeholder<X12345>) can be used to indicateGB 12345 characters, similarly to the sequenceESC $ ) A (also with theESC $ ) prefix) indicatingGB 2312, but only after it receives a registration in theISO-IR registry specifying what the final byte of the sequence is.^[3] As of 2023^[update], no such registration exists.^[4] However, the sameRequest for Comments also defines the encoding labelCN-GB-12345 forGB 12345 used with ASCII in a manner analogous toEUC-CN.^[3]

GB/T 12345 includes a few traditional characters which are different from the table of correspondences between Simplified Chinese characters and Traditional Chinese characters in the standardGeneral List of Simplified Chinese Characters.

• 隷 (33-05): The traditional counterpart of 隶 is 隸. 隷 is listed as a variant form in theFirst List of Processed Variant Chinese Characters.
• 𨻶 (47-22): 隙 has no traditional correspondence in the standard.
• 鳧 (57-76): The traditional counterpart of 凫 is 鳬. 鳧 is not in theFirst List of Processed Variant Chinese Characters either.

The characters in GB 12345 were taken as one of the sources for theHan unification which led to the unified set ofCJK characters in the initialISO 10646/Unicode standard. All the 6,866 Chinese characters were incorporated.

• GB/T 2312–80
• GB 13000
• GBK
• GB 18030

• "GB/T 12345-90 (CJKV Information Processing, Appendix F) "STSong-Light" font designed by Changzhou SinoType Technology"(PDF).

• Guobiao standards
• Chinese character encodings

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