<character> (BS) ASCII code 8, Control-H. The control
character that should cause most output devices to move their
current output position back to the previous character so that
the next character output will replace (or overprint) it.
Inputting a backspace (typically by pressing the backspace
key) causes many systems to delete the character before the
input cursor, though others use delete for this.
See twirling baton for an imaginitive use of backspace.
