- Abbreviation of negative-positive. It refers to the region where a p-type semiconductor and an n-type semiconductor meet. In a p-type semiconductor, holes, which act as positively-charged particles, are the majority carrier, while in an n-type semiconductor electrons, which are negative particles, are the majority carrier. Also called pn.
- chemical symbol for neptunium (written as Np)
- abbreviation for neper (written as Np)
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