I recommend adding Unicode Standard  - section 3.4 to that list 
Notably 10646:2017 doesn't define Abstract Character

On Sat, 13 Jun 2020 at 05:27, Tom Honermann via BlueJeans Network via SG16 <sg16@lists.isocpp.org> wrote:
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Meeting ID: 140 274 541



Description:
Meeting date: June 17th, 2020
Meeting time: 19:30-21:00 UTC (3:30pm-5:00pm EDT)
Draft agenda:
- Continue discussion of terminology updates to strive for in C++23
  - Resume discussion of relationships between (abstract) character, (character)
repertoire, (coded) character set, and character encoding.
    - Review ISO/IEC 10646:2017 section 3 terms and definitions
(https://standards.iso.org/ittf/PubliclyAvailableStandards/c069119_ISO_IEC_10646_2017.zip)
    - Review the Unicode glossary (https://www.unicode.org/glossary)
    - Review Corentin's email (https://lists.isocpp.org/sg16/2020/06/1493.php)
    - Compare and contrast terms as described by the above resources.
  - Determine suitability of ISO/IEC 10646 terms for use in the C++ standard.
  - Discuss the relationship of the above terms to named entities in the standard.
  - Identify possible terms to add to [intro.defs].

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