Turnstile

//ˈtɝnstaɪl// noun

Definitions

Noun
  1. 1
    A rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been paid.

    "The fare was fixed at 2d., irrespective of distance, and was paid by passengers on passing through turnstiles at each station."

  2. 2
    a gate consisting of a post that acts as a pivot for rotating arms; set in a passageway for controlling the persons entering wordnet
  3. 3
    A similar device in a footpath to allow people through one at a time while preventing the passage of cattle.
  4. 4
    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)". )

Etymology

From turn + stile.

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