calling card

Noun calling card has 3 senses

• calling card(n = noun.possession) phone card - a card that is used instead of cash to make telephone calls;
is a kind of charge card, charge plate, credit card, plastic

• calling card(n = noun.communication) card, visiting card - a printed or written greeting that is left to indicate that you have visited;
is a kind of greeting, salutation

• calling card(n = noun.cognition) - a distinguishing characteristic or behavior; "bombs are a terrorist's calling cards"
is a kind of distinctive feature, distinguishing characteristic, peculiarity

calling card