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 railway line, Adelaide, a closed railway line in Adelaide South Australia
• Semaphore (album), a 1998 album by Fridge
• Semaphore, fictional professor in Cubitus comic strips or Wowser cartoons

See also

• International maritime signal flags
• Telegraphy

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