What does "punctuation mark" mean?

Any of various symbols used in writing and printing to indicate pauses, divisions, etc. and to aid the reader in understanding what is written.

What is a synonym for "punctuation mark"?

Common synonyms include: colon, colons, glyph, mark, notational symbols, punctuation.

noun

noun ·Rare ·Advanced level

Noun

1
Any of various symbols used in writing and printing to indicate pauses, divisions, etc. and to aid the reader in understanding what is written.
2
the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases wordnet

Which vs That: Restrictive and Nonrestrictive Clauses

Use which and that with confidence in formal and everyday writing.