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flag shapes 
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
