C0 controls

The C0 controls are the control characters which are part of the ASCII standard (as adopted in 1967; the earlier 1963 version had somewhat different control character assignments). They are also part of a number of other character sets derived from ASCII, and are in the Unicode set at the same code positions they have in ASCII. The official definition gives particular meanings for each of the characters, though they have also been used in a number of other ways, and some of them are rarely used these days.