PK
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PK may stand for:
- Pakistan (ISO 3166-1 alpha-2 country code)
- Pakistan International Airlines (IATA code)
- Paperinik
- Penalty kick
- PariahKing, Administrator and Co-Creator of The Source
- Peak or park (map abbreviation)
- Pharmacokinetics
- Pickoff (baseball)
- pK - negative logarithm of the dissociation constant K (-logK)
- Placekicker (American football)
- Primary key
- Probability of kill (often used in simulation)
- Public key
- Preacher's kid (or pastor's kid, or, in the Anglican and [presumably] Eastern Orthodox denominations, Priest's kid. Also, occasionally, prophet's kid) (generally a tongue-in-cheek reference)
- Psychokinesis
- Player killer (in MMORPGs, MUDs and other computer role-playing games)
- Abbreviation of a profanity in Cantonese, meaning "damn it!" or "damned person".
- PK machine gun originating from the Soviet Union and produced by Russia.
- Parkour, an extreme sport
- PK - the short form for the cantonese foul phrase. (仆街)de:PK