In many GUI environments, including Microsoft Windows and most desktop environments based on the X Window System, and in applications such as word processing software running in those environments, control-V can be used to paste text or other content (if supported) from the clipboard at the current cursor position.
[1] [2] Control-V was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing.
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.
[3] The ASCII and Unicode representation of "Synchronous Idle" is 22 in decimal, which is 26 in octal and 16 in hexadecimal.