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Longman Dictionary of Contemporary English
calling card
noun
EXAMPLES FROM CORPUS
▪ On a longer call, however, a calling card can be cheaper than a prepaid phone card.
▪ That little yodel in the chorus serves as a personal calling card.
▪ Until 1900, cards were not signed, but hand delivered with a calling card.
▪ We left our calling card on the enemy with those bombs at the checkpoint.
Wiktionary
calling card

alt. 1 A small printed card which identify 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 (context idiomatic English) An attribute, object, or behavior which is distinctly characteristic of someone or something. 3 (context euphemistic English) excrement, especially of a domestic animal. 4 A phonecard. n. 1 A small printed card which identify 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 (context idiomatic English) An attribute, object, or behavior which is distinctly characteristic of someone or something. 3 (context euphemistic English) excrement, especially of a domestic animal. 4 A phonecard.

WordNet
calling card
  1. n. a card that is used instead of cash to make telephone calls [syn: phone card]

  2. a printed or written greeting that is left to indicate that you have visited [syn: visiting card, card]

  3. a distinguishing characteristic or behavior; "bombs are a terrorist's calling cards"

Wikipedia
Calling Card

Calling Card is the sixth studio release by Irish singer/guitarist Rory Gallagher. A 1976 release, it was his second of four albums released on Chrysalis Records in the 1970s. Deep Purple/ Rainbow bass guitarist Roger Glover co-produced with Gallagher: it was the first time that Gallagher worked with a "name" producer and the only successful such collaboration. It was also the last album Gallagher would do with Rod de'Ath (drums) and Lou Martin (keyboards). After Calling Card Gallagher retained only his long-time bass guitarist Gerry McAvoy and hired Ted McKenna on drums. This revised power trio was Gallagher's line up for the next five years, when Brendan O'Neil took the sticks.

Calling card (crime)

A calling card is a particular object sometimes left behind by a criminal at a scene of a crime, often as a way of taunting police or obliquely claiming responsibility. The name is derived from the cards that people used to show they had been to visit someone's house when the resident was absent. A calling card can also be used as an individual's way of telling someone they are alive after they have run away or disappeared without revealing themselves or having direct contact with that person. It is often left at a bed side table while the person is asleep.

Usage examples of "calling card".

Perhaps Duke Stanwin commissioned Rayner to fashion cards, and this is some password or calling card.

Only then did she realize what the plate was for-her calling card.

Wordlessly she entered and handed Margaret a calling card, then left almost before the words “.

Only then did she realize what the plate was for her calling card.

I don't regret doing it, because he was a bomb-happy piece of scum who had left his calling card on a cruise ship, killing nine old people who were just trying to enjoy their retirement.

The Englishman and the peculiar calling card with the European phone numbers, the Englishman who was leaving for the coast tomorrow to see a California man who had lately drowned and been brought back to life.