General Punctuation is a Unicode block containing punctuation, spacing, and formatting characters for use with all scripts and writing systems.
The null coalescing operator (called the Logical Defined-Or operator in Perl) is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, including C#, Perl as of version 5.10, Swift, and PHP 7.0.0.
A question is a linguistic expression used to make a request for information, or the request made using such an expression.
The question mark (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages.
A question mark is a type of punctuation mark.