Pakistan (ISO country code PK)

The term psychokinesis (from the Greek ψυχή, "psyche", meaning mind, soul, or breath; and κίνησις, "kinesis", meaning motion; literally "movement from the mind")[1][2] , also known as telekinesis[3] (Greek τῆλε + κίνησις,...

Pharmacokinetics (in Greek: "pharmacon" meaning drug and "kinetikos" meaning putting in motion, the study of time dependency) is a branch of pharmacology dedicated to the determination of the fate of substances administered externally to a living...

Paul Kagame, president of Rwanda

Parkour, a physical art

Public-key cryptography

Pakistan International Airlines (IATA airline code PK)

Horsepower (Dutch abbr. paardenkracht)

Paperinik, cartoon character

Promise Keepers, a Christian men's organization

Pentax K Mount, Pentax K lens mount

Penalty kick, in association football (soccer)

Park (map abbreviation)

Phil Katz, creator of the PKZIP file compression software

Pink Sheets, a securities-trading information system

Placekicker, in American football

PK machine gun

Preacher's kid

Probability of kill (often used in simulation)

Polyteknikkojen Kuoro, a Finnish academic male choir

Penalty kill, in ice hockey

Pyramidal peak (map abbreviation)

Possum Kingdom Lake, Texas

Puk Kai, a Cantonese profanity (仆街)

Disney's PK: Out of the Shadows, a video game

Packages, it is a shortform

Public Knowledge

Player killer, term for person who kills players in an MMORPG.