Semaphore
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Semaphore can refer to:
- Semaphore communication by means of flags or other positional indicators.
- A mechanical device (a semaphore signal) used in railway signalling
- Semaphores in computer science, in which only one part of a concurrent system may access a limited resource. This application of mutual exclusion in computing was invented by Edsger Dijkstra.
- Semaphore, South Australia, an historic seaside community.