# What is a word for non alpha numeric characters that are the same when opened and closed?

Edited: I'm searching for a way to describe this: When using *"quotes"*, **one character** is used **twice**: " When using *(parentheses)*, **two characters** are used **once**: ( ) Is there a word for this property? Common language, grammar, vocabulary? Sentence Examples: ***" The quotes that exist before and after this sentence are the same character. "*** ***( The parentheses that exist before and after this sentence are two separate characters. )*** How can I explain this "difference" in a word (or maybe a few)? Thanks!