back·space 
(băkspās′)
(băkspās′)intr.v. back·spaced, back·spac·ing, back·spac·es
a. To move an onscreen cursor one character to the left, typically deleting the character that is there, by pressing the backspace key.
b. To move a typewriter carriage back one space by striking the backspace key.
n.
The backspace key.