Actually, "rub out" goes all the way back to Teletype keyboards: > "This code was originally used to mark deleted characters on punched tape, since any charact

Actually, "rub out" goes all the way back to Teletype keyboards: > "This code was originally used to mark deleted characters on punched tape, since any character could be changed to all ones by punching holes everywhere. If a character was punched erroneously, punching out all seven bits caused this position to be ignored or deleted, a computer version of correction fluid." See: https://en.wikipedia.org/wiki/Delete_character#History https://en.wikipedia.org/wiki/Delete_character#History