In computing, Control-V is a key stroke with a variety of uses including generation of a control character in ASCII code, also known as the synchronous idle (SYN) character. The key stroke is generated by typing Ctrl+V. On MacOS based systems usually ⌘ Cmd+V is used instead.
Unix interactive terminals use Control-V to mean "the next character should be treated literally" (the mnemonic here is "V is for verbatim"). This allows a user to insert a literal Control-C or Control-H or similar control characters that would otherwise be handled by the terminal. This behavior was copied by text editors like vi and Unix shells like bash and tcsh, which offer text editing on the command line.[3]
Representation
The ASCII and Unicode representation of "Synchronous Idle" is 22 in decimal, which is 26 in octal and 16 in hexadecimal.