Skeleton key
Key modified to unlock a variety of locks / From Wikipedia, the free encyclopedia
For other uses, see Skeleton Key (disambiguation) and Passkey.
A skeleton key (also known as a passkey[1]) is a type of master key in which the serrated edge has been removed in such a way that it can open numerous locks,[2] most commonly the warded lock. The term derives from the fact that the key has been reduced to its essential parts.[2]