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See also: turn-stile
turnstile (plural turnstiles)
- A rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been made.
- (mathematics, logic) The symbol used to represent logical entailment (deducibility relation), especially of the syntactic type; i.e., syntactic consequence. (Such symbol can be read as "prove(s)"  or "give(s)". )
- (mathematics, logic): double turnstile
rotating mechanical device