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Parenthesis is singular, parentheses is plural. One parenthesis, two parentheses. Like crisis/crises, axis/axes.
but, parentheses always comes in pairs.
if not someone needs to be executed
They sure do, unless you missed a parenthesis and somebody wants to point that out ;)
The op image incorrectly used the singular when they meant the plural
Smileys? :)? Unpaired?
Unless you specifically meant the side thought use
You might want to refer to the left parenthesis or the right parenthesis and then it would be incorrect to use the plural.