A subgenre of crime fiction which portrays the activities of a police force as they investigate crimes. Unlike in other types of crime fiction, the perpetrator may be known at the outset of the story.

A unit of the police specifically trained to deal with rioting crowds. They use special equipment for personal defense as well as for crowd control and dispersal.

A dog trained and employed by the police to pursue suspects or sniff out contraband. / (dated) Synonym of German shepherd

(US) An insurance policy on a piece of real estate for which the title deeds may be incomplete or not properly searched.

A period of darkness that occurs in winter in polar regions north from the Arctic Circle and south from the Antarctic Circle, and during which the sun stays below the horizon.

A particular kind of long tool with various uses in firefighting.

(US) A register, maintained by the desk sergeant, of people arrested or brought in for questioning to a police station; (UK) charge sheet. / (US) A newspaper column publishing highlights therefrom.

(planetology) A high-latitude region of a celestial body that is covered by ice.

(engineering) A measure of a body's resistance to twisting; a measure of torsional strength.

A line, often marked with yellow tape, demarcating a crime or accident scene and which bystanders are not supposed to cross. / A line of police officers standing guard.