distinguishing mark

Some of his violins possess a distinguishing mark in a rather abrupt rise in the centre.

To Aristotle, and centuries later to Plutarch, the distinguishing mark of poetry was imitation.

As a distinguishing mark of esteem, two friendly Negroes of Ardra drink out of one cup at the same time.

It was the distinguishing mark of Morgan's Virginia Rangers, the deadliest sharpshooters in the world.

Its very long tail feathers—from fifteen to twenty inches—will always prove a distinguishing mark.