--, a string of two hyphen-minus characters, may approximate or refer to:
Em dash (—), as a typewriter approximation Sig dashes (--), the email and Usenet signature delimiter The letter 'M' in Morse code A prefix for long options in Unix-like operating system commands; by itself, it typically means the end of command options The decrement operator in some programming languages Inline comments in some programming languages
See also
--- (disambiguation) (three hyphens) Double hyphen (one above the other) dash (–) HTML comment tag wrappers, and Horizontal rule, which is represented by in MediaWiki markup