Hat

HAT is also the abbreviation for histone acetyltransferase. ---

A hat is an item of clothing which is worn on the head – a kind of headgear. Hats often have a brim, and may be either placed on the head, or in the case of some women's hats, secured with hat-pins (which are pushed through the hat and the hair). Depending on the type of hat, they are typically worn exclusively by men, women or by either sex.

Dipsy from the Teletubbies wears a hat.

Parts of a hat

• Crown - the portion of a hat covering the top of the head
• Bill - a projection of stiff material from the bottom of the hat's crown, typically forward, and usually for shading the eyes (also "peak")
• Brim - a projection of stiff material from the bottom of the hat's crown horizontally all around the circumference of the hat

See also

• Tinfoil hat
• The Sorting Hat
• Chapeaugraphy

The neurologist Oliver Sacks wrote a book entitled The Man Who Mistook His Wife for a Hat.

Michael Nyman later wrote an opera with the same title, based on the case-study which gave that book its name.