Also known as automotive piston
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A piston is a moving part inside a cylinder that seals tightly using special rings, and it's found in engines, pumps, and compressors. It matters because it transfers force between expanding gases (or liquids) and rotating shafts, making it essential for converting the energy in engines or moving fluids in pumps and compressors.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).