backspace key

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A key that, when pressed, moves an onscreen cursor one space to the left and typically deletes the character in that space.
• noun A similar key on a typewriter that, when pressed, moves the carriage to the position of the previous space on the page.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the typewriter key used for back spacing