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turnstile |
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turnstile Logic a symbol of the form ├, ÿE;, or ╟, used to represent logical consequence when inserted between expressions to form a sequent, or when prefixed to a single expression to indicate its status as a theorem turnstile [′tərn‚stīl] (engineering) A barrier that rotates about a vertical axis and usually is arranged to allow the passage of only one person at a time through an opening. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Optical turnstyles which scan swipe cards and restrict access for certain floors and offices, are also popular. When you cross through the turnstyle and pass into Mexico, you might encounter one cop sitting on a folding chair, as opposed to the gantlet you face coming the other direction. Readers also produced an audiobook version of Lawrence Lessig's Free Culture (Penguin), recording a chapter each at turnstyle. |
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