hallmark

/ˈhɔːlmɑːk/ noun [C]

Definition

› an attitude or quality that is thought to be typical of a person or organization: Recent documentaries have embodied the pioneering spirit that has come to be the channel's hallmark. the hallmarks of sth We have a system of open justice in this country that we believe to be one of the hallmarks of a democratic society.

› a sign or symbol used by manufacturers of products made from gold, silver, or platinum that shows that the metal is of good quality, as well as the date and place it was manufactured

(Definition of hallmark noun from the Cambridge Business English Dictionary © Cambridge University Press)