Latchkey

Latchkey or Latch-key is a term that may refer to:

Latchkey kid, a child who returns from school to an empty home because his or her parents are away at work
Operation Latchkey, a series of 38 nuclear test explosions conducted in 1966 and 1967 at the Nevada Test Site
The Latch-Key Child, the first album by the child rapper A+