Shuttlecock Roof

This roof looks like shuttlecock.

A shuttlecock is a high-drag projectile used in badminton and other sports. In badminton, it has an open conical shape: the cone is formed from sixteen overlapping goose feathers embedded into a rounded cork base. The cork is covered with thin leather.

The shuttlecock's shape makes it extremely aerodynamically stable. Regardless of initial orientation, it will turn to fly cork first, and remain in the cork-first orientation.

The name shuttlecock is frequently shortened to shuttle; it may also be known as a bird or birdie. The "shuttle" part of the name was probably derived from its back-and-forth motion during the game, resembling the shuttle of a loom; the "cock" part of the name probably derives from the resemblance of the feathers to those on a cockerel.

(source: Wikipedia)