Semaphore Flag Signaling System, a fictional internet standard for transmitting Internet Protocol packets
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Effluent sewer, also called a solids-free sewer system (SFSS), a sewer system that treats waste in septic tanks before pumping the effluent to a central plant
In computer networking, Semaphore Flag Signaling System (SFSS) is a humorous proposal to carry Internet Protocol (IP) traffic by semaphores.