What does "paren" mean?

A parenthesis (bracket used to enclose parenthetical material in text).

What is a synonym for "paren"?

Common synonyms include: parenthesis.

/pəˈɹɛn/ noun, slang

noun, slang ·Uncommon ·College level

Noun

1
A parenthesis (bracket used to enclose parenthetical material in text). especially, informal

Clipping of parenthesis.