(via skeletonbed)Source: ulan-bator
also known as a passingkey - either a key that has been altered in such a way as to bypass the wards placed inside a warded lock, or a card that contains information necessary to open locks for a certain area like a hotel etc., or an American term for a lever or “bit” type key. The term derives from the fact that the key has been reduced to its essential parts.
The term “skeleton key”, in a more general sense, is also sometimes used in reference to a key or similar object capable of opening any lock regardless of make or type, the term is self-explanatory, referring to the a skeletal structure which can bypass all locks. Skeleton keys are similar to master keys and bump keys.