flag shapes [1]

burgee

Triangular flag with two points used to indicate the affiliation of a ship.

swallowtail

Nautical flag that indicates the nationality of a vessel and the company to which it belongs; it is also used for signaling.

swallowtail and tongue

Flag with a long narrow piece (tongue) between two swallowtail points.

double pennant

fanion

Small triangular flag used for a variety of purposes, such as to represent a head of state or a military unit.

rectangular flag

square flag