Hat, formerly Haš is a village in the Moravian-Silesian Region of the Czech Republic. It is part of micro-region Hlucínsko. It has around 2,500 inhabitants.

A hat is a head covering which is worn for various reasons, including protection against the elements, ceremonial reasons, religious reasons, safety, or as a fashion accessory. In the past, hats were an indicator of social status. In the military, hats may denote nationality, branch of service, rank and/or regiment. Police typically wear distinctive hats such as peaked caps or brimmed hats, such as those worn by the Royal Canadian Mounted Police. Some hats have a protective function. As examples, the hard hat protects construction workers' heads from injury by falling objects and a British police Custodian helmet protects the officer's head, a sun hat shades the face and shoulders from the sun, a cowboy hat protects against sun and rain and a Ushanka fur hat with fold-down ear-flaps keeps the head and ears warm. Some hats are worn for ceremonial purposes, such as the mortarboard, which is worn (or carried) during university graduation ceremonies. Some hats are worn by members of a certain profession, such as the Toque worn by chefs. Some hats have a religious functions, such as the Mitres worn by Bishops and the turban worn by Sikhs.

A hat is an item of clothing worn on the head.

hat. is the first studio album by Mike Keneally, originally released in 1992 on Exowax Recordings. It includes the 14 minutes-long complex composition "Lightin' Roy" (dedicated to Frank Zappa) performed entirely by Mike.

Hydrogen astatide, also known as astatine hydride, astatane, or astidohydrogen, is a chemical compound with the chemical formula HAt, consisting of an astatine atom covalently bonded to a hydrogen atom.