calling card

noun

1. 1.A small printed card which identifies the bearer, traditionally presented for introduction when making a social visit to a home or when attending a formal social event or business meeting.
2. 2.An attribute, object, or behavior which is distinctly characteristic of someone or something.
3. 3.Excrement, especially of a domestic animal.
4. 4.A phonecard.
5. 5.A card advertising the services of a prostitute.