parenthesis

nouns

either of two punctuation marks (or) used to enclose textual material
parenthesis
is a type of (narrower)
the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases
punctuation, punctuation mark
a message that departs from the main subject
aside, digression, divagation, excursus, parenthesis
is derived from
parenthetical
is derived from
parenthetic