The provincial seal shows a triangular flag, a symbol of victory in war.

Taoist temples may fly square or triangular flags.

From the highest roof-top was flying a white triangular flag.

By the 18th century this began to be flown as a rectangular as opposed to triangular flag, but remained essentially unchanged.

This was a triangular red flag with an elongated white cross.

A cord with small triangular flags was strung across the entrance to the rest area.

When I see small, plastic triangular flags like these, I think of used cars.

One with a small triangular red-and-blue flag.

In addition, pennants were known to be flown, illustrated as a triangular flag containing the same five pointed star and crescent.

Rectangular as well as triangular flags were used.