hallmarks: meaning and definitions

A mark indicating quality or excellence.

A mark used in Great Britain to stamp gold, silver, and platinum articles that meet established standards of purity. Any of various authorized marks stamped on gold, silver, and platinum articles to indicate where, when, or by whom they were made or assayed.

A conspicuous feature or characteristic:"The sense of guilt is the hallmark of civilized humanity"(Theodor Reik).