adjective Using, containing, or within parenthesis.
You wrote "Bob (my best friend) works in finance", but I think you should rephrase that parenthetical part.
adjective Explaining or qualifying something.
adjective Incidental.
noun A word or phrase within parentheses.
noun A descriptor or modifier enclosed within parentheses and put, indented, in a line of dialogue to describe how it should be acted or directed onscreen.