The typewriter key used for back spacing WordNet 3.0 & Open English WordNet

Backspace is the keyboard key that originally pushed the typewriter carriage one position backwards and in modern computer systems moves the display cursor one position backwards, removes the character at that position, and shifts back the cursor back by one position. Wikipedia

Keyboard key Wikipedia Disambiguation

Computer keyboard key used to delete the character preceding the cursor Wikidata

A keyboard key used for removing a character behind the cursor, and moving the cursor one position backwards. Wiktionary

A mechanism in a typewriter that controls backspacing. Wiktionary