Editing PK (section)

==Science and technology==
===Chemistry and pharmacology===
* pK, negative logarithm of the [[dissociation constant#Acid–base reactions|dissociation constant]] K (-logK)
* [[Pharmacokinetics]], a branch of pharmacology dedicated to determining the fate of substances administered to a living organism

===Computing===
* [[Primary key]], a unique attribute within the relational model of databases
* PK, a magic number commonly used in the [[Zip (file format)|Zip]] file format
* [[.pk]], the country code top level domain (ccTLD) for Pakistan
* [[Port knocking]], a method of externally opening ports on a firewall
* [[Public-key cryptography]]

===Other uses in science and technology===
* [[PK machine gun]], a Soviet weapon, abbreviated from ''Pulemyot Kalashnikova'' (Kalashnikov machine gun)
* [[Horsepower]] (Dutch abbreviation ''paardenkracht'')
* [[Pentax K-mount]], a camera lens mount
* [[Catalogue of galactic planetary nebulae]] (Perek-Kohoutek), in astronomy
* [[Renault PK]], a car made by Pars Khodro between 2000 and 2005
* [[PK screw]]s, self-tapping screws (Parker-Kalon) for sheet metal