A flattop is a type of very short hairstyle similar to the crew cut, with the exception that the hair on the top of the head is styled to deliberately stand up (typically no more than an inch or two) and is cut to be flat, resulting in a haircut that is square in shape. It is most often worn by men and boys, particularly those in the military and law enforcement in the United States.
Because the shape of a flattop is, by definition, not compatible with the round shape of a human head, there is often a spot on the very center of the top that is buzzed shorter to achieve a flat surface, almost to the point of being shaved. This area is called the "landing strip," because this area of the head with shorter hair ressembles a grassless aviation landing area.
Because the haircut is so short and quickly grows out of its precisely-cut shape, maintenance haircuts are required every few weeks, though some flattop wearers get haircuts as often as once a week.
There are several varieties of flattops. One of the longest types, the "Flattop DA" (Duck's Ass) was popular in the 1950s and 1960s and featured the hair of the sides of the head being longer and combed back. At the other end of the spectrum is the horseshoe flattop, in which all of the hair on the sides and back are completely shaved to the skin (called "whitewalls"), as is the "landing strip" on the top, leaving only a U-shape ring of hair on the top of the head. The horeshoe flattop is related to the high and tight and is particularly popular with United States Marines and Army Rangers.
Fellow NFL Hall of Famer Howie Long was also noted for his flattop in the 1980s, and still maintains the hairstyle today.
National Basketball Association players Chris Mullin, Eric Montross, and Greg Ostertag were known for their trademark horseshoe flattops.
Comedian Drew Carey famously had a flattop throughout his hit sitcom, The Drew Carey Show.
A few female celebrities, including performer Grace Jones and lesbian folksinger Phranc have also worn flattops.