A secret passage type of entrance/exit. It could be a tricky device used to make people fall into a bottomless pit as they walk over it unawares, or simply a door at the top of a ladder which is inlaid in the floor above.

trap = T = trash

trap door n.

(alt. `trapdoor') 1. Syn. back door -- a Bad Thing. 2. [techspeak] A `trap-door function' is one which is easy to compute but very difficult to compute the inverse of. Such functions are Good Things with important applications in cryptography, specifically in the construction of public-key cryptosystems.

--Jargon File, autonoded by rescdsk.

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