Noun
(electronics) Short for NPN transistor.
An NPN, in conjunction with a PNP and resistors, can be used to create logic gates.
(biology) Initialism of non-protein nitrogen.
Source: en.wiktionary.orgWe made a completely new kind of transistor (the NPN BJT, and in our development work, our researcher, Leo Esaki, demonstrated the electron tunneling effect, which led to the development of the tunnel diode for which he was awarded a Nobel Prize seventeen years later, after he had joined IBM. Akio Morita
“And this is the reason why all political conferences that took place after NPN, the idea of zoning kept coming up in such conferences and had been adopted by some conferences as a provision in Nigeria constitution.” Source: Internet
An NPN transistor comprises two semiconductor junctions that share a thin p-doped anode region, and a PNP transistor comprises two semiconductor junctions that share a thin n-doped cathode region. Source: Internet
A mnemonic device for the NPN transistor symbol is "not pointing in", based on the arrows in the symbol and the letters in the name. citation PNP The symbol of a PNP BJT. Source: Internet
A mnemonic device for the PNP transistor symbol is "pointing in (proudly/permanently)", based on the arrows in the symbol and the letters in the name. citation Heterojunction bipolar transistor Bands in graded heterojunction NPN bipolar transistor. Source: Internet
NPN BJT with forward-biased E–B junction and reverse-biased B–C junction Charge flow in a BJT is due to diffusion of charge carriers across a junction between two regions of different charge concentrations. Source: Internet