A signal is a sound, action, or sign that sends a message or instruction. In technology, it is an electrical or radio wave that carries information.
“Signal” comes from French “signal,” from Italian “segnale,” based on Latin “signum,” meaning mark or sign. It originally meant a distinguishing mark or sign. As science and technology developed, the word was applied to coded messages carried by telegraph, radio, and electronics.
Signal is just a high-tech cousin of sign, upgraded for wires and waves. Whether it’s a hand signal in sports or a Wi‑Fi signal, the job is the same: carry meaning from one place to another. The digital age didn’t invent signaling; it just changed the medium.
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