Wiktionary:Word of the day/2020/February 22

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Word of the day
for February 22
semaphore n
  1. Any equipment used for visual signalling by means of flags, lights, or mechanically moving arms which are used to represent letters of the alphabet, or words.
  2. (also figuratively) A visual system for transmitting information using the above equipment; or (by extension) by means of two flags held one in each hand, using an alphabetic and numeric code based on the position of the signaller's arms; flag semaphore.
  3. (computing) A bit, token, fragment of code, or some other mechanism which is used to restrict access to a shared function or device to a single process at a time, or to synchronize and coordinate events in different processes.
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