Wrap standalone mathematical symbols in MathML

[abcdsen-create]

Priority: High

Description

Add
guidance that non-everyday mathematical symbols must use MathML even when they
appear alone in glossaries, tables, captions, or running text. Plain-text
symbols such as ∈, ∉, and ⊂ may be skipped or
mispronounced because mathematical speech rules are not invoked.

Recommended markup

<math
xmlns="http://www.w3.org/1998/Math/MathML"><mo>∈</mo></math>

Acceptance criteria

• Guidance defines or illustrates which symbols require MathML.
• Examples cover standalone symbols in a glossary or table.
• The listed symbols are verified with the supported text-to-speech pipeline.
• Production QA checks for unwrapped mathematical symbols in HTML text.