What is the meaning of Flatiron?

A simple iron (for pressing laundry) which is heated on a stove.

A pair of metal tongs with heated ceramic plates used for straightening hair.

a quadrilateral with two parallel sides, one of which is very short, and whose non-parallel sides are longer than either parallel side.

A steeply sloping triangular landform created by the differential erosion of a steeply dipping, erosion-resistant layer of rock overlying softer strata.

Having a flatiron shape.

Source: wiktionary.org

See also