From The Free On-line Dictionary of Computing (19 January 2023):
left parenthesis
(
open parenthesis
<character> "(". ASCII character 40.
Common names: left paren; left parenthesis; left; open;
paren (")" = thesis); open paren; open parenthesis; left
parenthesis; left banana. Rare: so (")" = already); lparen;
ITU-T: opening parenthesis; open round bracket, left round
bracket, INTERCAL: wax (")" = wane); parenthisey (")" =
unparenthisey); left ear.
Paired with right parenthesis (")").
(1995-03-06)