Variation Selectors Supplement is a Unicode block containing additional variation selectors beyond those found in the Variation Selectors block.

These combining characters are named variation selector-17 (for U+E0100) through to variation selector-256 (U+E01EF), abbreviated VS17 – VS256.

As of 12 December 2017, VS17 (U+E0100) to VS48 (U+E011F) are used in ideographic variation sequences in the Unicode Ideographic Variation Database (IVD).^[3][4] These selectors are known as Ideographic Variation Selectors (IVS). They are not listed in the list of standardized variation sequence, instead they are listed in another Ideographic Variation Database.^[3]

The following IVS collections are currently registered in the IVD:^[3]

Region	Name	Purpose	First registered	Last updated	Number of sequences	Chart
Japan	Adobe-Japan1	CID-keyed Japanese OpenType fonts. Defines at least one sequence for every Japanese kanji from the Adobe-Japan1 collection present in Unicode, even for those with only one glyph, both as future-proofing and to allow that (Japan-region) glyph to be uniquely referenced.[5]	2007-12-14	2022-09-13	14684	All Adobe sequences Contrastive Adobe sequences
Japan	Hanyo-Denshi	Unicode characters corresponding to more than one glyph collected by the Han'yō Denshi programme, a union of the character repertoires of the legacy kanji character sets used by multiple administrative systems in Japan (precursor to Moji Jōhō Kiban).[6] Approximately 60% of the initial registration matches Adobe-Japan1 glyphs, but the existing Adobe-Japan1 variation sequences are not used for them.[7]	2010-11-14	2012-03-02	13045	All Han'yō Denshi sequences
Japan	Moji_Joho	Unicode characters corresponding to more than one entry in the Moji Jōhō Kiban, a database of kanji used for administrative purposes in Japan. Supersedes and deprecates the Hanyo-Denshi collection, from which it retains 9866 of the existing IVSes.[6]	2014-05-16	2017-12-12	11384	All Moji Jōhō sequences
Macau	MSARG	Macao Supplementary Character Set (MSCS)	2016-08-15	2020-11-06	154	All MSCS sequences
South Korea	KRName	Standard character variants permitted in personal names in South Korea	2017-12-12		36	All Korean name sequences

Similarly to the Moji Jōhō Kiban's role in Japan, the character repertoire of CNS 11643 (including draft revisions) is used for administrative purposes in Taiwan.^[8] In some cases, multiple of these correspond to a single Unicode character.^[9] Many of these cases are currently handled with mappings to the Supplementary Private Use Area.^[9] However, the Taipei Computer Association, which represents the interests of Taiwan in the Ideographic Research Group, has been evaluating the feasibility of registering an additional IVD collection in the future.^[9][10]

The following Unicode-related documents record the purpose and process of defining specific characters in the Variation Selectors Supplement block: