thumb|right|Coastal semaphore using moving arms at Scheveningen, circa 1799
thumb|right|Coastal semaphore using moving arms at Scheveningen, circa 1799
Semaphore (; ) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when arranged in visually connected networks, or for traffic signalling such as in railway systems, or traffic lights in cities.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).