Flat

Flat or flats may refer to:

Architecture

Apartment, known as a flat in the United Kingdom, Ireland, and other Commonwealth countries

Flat (music), a symbol (♭) which denotes a lower pitch
Flat (soldier), a two-dimensional toy soldier made of tin or plastic
Flat (theatre), a flat piece of theatrical scenery
Flat, a leading type of wordplay, as identified by the National Puzzlers' League
Flat! (2010), an Indian film
Flats (band), an English sludge metal and punk band
Flats (comics), the first stage in the comic coloring process

Flats, footwear which is not high-heeled
Ballet flats, derived from ballet shoes, for casual wear as well as dancing
Ballet shoes (also known as ballet slippers), often referred to as "flats" or "flat shoes"
Racing flats, lightweight shoes used primarily for running a race

Flat, a shallow water area in the context of boating, fishing or marine biology, often used in plural form
- Brewster Flats, an area of Cape Cod Bay off the shore of Massachusetts, U.S.
- Kentish Flats Offshore Wind Farm, off the coast of Kent, England
- Rhyl Flats, a wind farm off the coast of North Wales
Flat coast, a shoreline where the land descends gradually into the sea

Flat function, a real function where all derivatives at a point are 0
Flat (geometry), the generalization of lines and planes in an n-dimensional Euclidean space
Flat (matroids), a further generalization of flats from linear algebra to the context of matroids
Flat module in ring theory
Flat morphism in algebraic geometry
Flat space, a space with zero curvature
Flat surface (geometry), a surface with zero curvature
Flat sign, for its use in mathematics; see musical isomorphism, mapping vectors to covectors

FLATS or First Lady Astronaut Trainees, American women who underwent NASA Project Mercury physiological screening tests

Flat (gridiron football), the area of the gridiron football field
Flat butterflies or flats, certain skipper butterfly genera in subfamily Pyrginae:
- Calleagris (scarce flats),
- Celaenorrhinus of tribe Celaenorrhinini;
- Eagris, and
- Tagiades (water flats, snow flats), of tribe Tagiadini
Flat (USPS), an oversized letter
Flat (watercraft), a type of barge, especially on the River Mersey
Optical flat, an extremely flat piece of glass