What is the meaning of Turnstile?
A rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been paid.
A similar device in a footpath to allow people through one at a time while preventing the passage of cattle.
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)". )
Source: wiktionary.org
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