TURNSTILE

Turnstile

A turnstile, also called a baffle gate, is a form of gate which allows one person to pass at a time. It can also be made so as to enforce one-way traffic of people, and in addition, it can restrict passage only to people who insert a coin, a ticket, a pass, or similar. Thus a turnstile can be used in the case of paid access, for example public transport as a ticket barrier or a pay toilet, or to restrict access to authorized people, for example in the lobby of an office building.

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turnstile

Noun

  1. A rotating mechanical device that controls and counts passage between public areas, especially one that only allows passage after a charge has been made.
  2. The <math>\vdash</math> symbol used to represent (deducibility relation), especially of the syntactic type, i.e., syntactic consequence. (Such symbol can be read as "proves".)
    Comma-separated elements preceding the turnstile should be interpreted as forming a conjunction, whereas comma-separated elements following the turnstile should be interpreted as forming a disjunction.


The above text is a snippet from Wiktionary: turnstile
and as such is available under the Creative Commons Attribution/Share-Alike License.

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