Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym PNPN is...

PNPN is

Positive-Negative-Positive-Negative (transistor)

More Meanings For PNPN:

Positive-Negative-Positive-Negative transistor (a switch)
Positive-Negative-Positive-Negative (transistor)

PNPN is also in:

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