calling card noun
plural ∼ cards [count] US 1 : a plastic card that allows a person to charge telephone calls to an account —called also phone card 2 old-fashioned : a small card presented when making a formal visit to someone that has the name and sometimes the address of the visitor — often used figuratively to describe something that identifies a particular person or group ▪ The young actor's bright smile is his calling card. —called also (Brit) visiting card
