What symbol do we use to denote a character?

'Single Quotes'

(Parenthesis)
"Double Quotes"
&Ampersands&

In most programming languages we use single quotes ''

Explanation:

Double quotes are used for strings (multiple characters, hence more lines)

Whereas Ampersands can be used for variable interpolation in some programming langues and parenthesis usually define parameters in functions.

Edit 1:

I have attached a screenshot from code I have submitted as answers to other questions - here you can see the use of characters and strings. Here is what happens when I try and use a double quote to represent a character.