Unicode 15.1 adds 627 characters, for a total of 149,813 characters.

There are several significant themes for this release of the Unicode Standard.

• The repertoire addition consists almost entirely of urgently needed CJK ideographs, synchronized with planned additions to the Chinese national standard, GB 18030. The remaining additions to the repertoire extend the set of ideographic description characters, to better enable description of unusual CJK ideographs.
• Major updates were made to UAX #9, Unicode Bidirectional Algorithm, UAX #31, Unicode Identifiers and Syntax, and UTS #39, Unicode Security Mechanisms, to coordinate with the publication of an important new Unicode Technical Standard: UTS #55, Unicode Source Code Handling.
• Segmentation rule changes, most notably:
  1. Support was added to line breaking (UAX #14, Unicode Line Breaking Algorithm) for orthographic syllables in a number of South and Southeast Asian writing systems.
  2. Grapheme cluster breaking (UAX #29, Unicode Text Segmentation) has adopted the aksara cluster behavior for six scripts. That cluster breaking behavior had previously been widely available via CLDR and ICU.
  3. These changes involved significant character property updates.

Supersedes: Unicode 15.0.0