Semaphore

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Semaphore may be:

Optical-telegraph systems:

Semaphore line, a system of long-distance communication based on towers with moving arms
Flag semaphore system
Railway semaphore signal for railroad traffic control

Other:

Traffic semaphore, another name for automotive traffic lights based on their early resemblance to railway semaphores
Turning semaphore, retractable semaphores on automobiles from the 1920s to 1950s
Semaphore (programming), in computer science, a mechanism for supporting mutual exclusion in concurrent programs
Semaphore, South Australia, a historic seaside community in southern Australia
Semaphore (album), a 1998 album by the band Fridge
Semaphore, fictional professor in Cubitus comic strips or Wowser cartoons

See also