Etymology

pMOSFET

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Today it means: A type of metal–oxide–semiconductor field-effect transistor (MOSFET) that utilizes an p-type channel, conducting when a voltage voltage below a threshold is applied to the gate relative to the source. It is commonly used in complementary metal–oxide–semiconductor (CMOS) technology alongside nMOSFETs. Full definition →

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The story

p + MOSFET, where n denotes "positive" or "p-type".

Etymology from Wiktionary, CC BY-SA 4.0.