(role-playing games, video games) Initialism of non-player character/non-playable character. / (slang, by extension) An ignorant, foolish person who has no will of his or her own.

(Philippines) Initialism of National Power Corporation. / (Philippines) Initialism of National Privacy Commission. / (sports) Initialism of National Paralympic Committee.

(intransitive) To act as an NPC (“non-player character”) in a game.

Nitrogen, Phosphorus, Potassium (or Potash)

Initialism of National Democratic Party of Germany.

Initialism of narcissistic personality disorder. / Initialism of nonpayment of dues.

(linguistics) Initialism of negative polarity item: a word that requires the sentence to be negated. / (medicine) Initialism of non-pharmaceutical intervention.

(medicine) "nil per os" (nothing by mouth - nothing may be eaten or drunk)

Initialism of non-profit organization.

(softball) Initialism of The National Pro Fastpitch, the senior softball league in the US. / Initialism of National Progressive Front.