[1] : WordNet (r) 2.0

calling card
     n 1: 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"
see also:
phone card visiting card card 

[2] : Moby Thesaurus II by Grady Ward, 1.0

19 moby thesaurus words for "calling card":
   id card, badge, calligram, card, countermark, countersign,
   credentials, dog tag, identification, identification badge,
   identification tag, initials, letter of introduction, monogram,
   press card, serial number, signature, tessera, visiting card

Calling Card >> C Words
Calling Card, definition of term: Calling Card
calling+card_pag1.html

Card >> C Words
Card, definition of term: Card
card_pag1.html

Calling >> C Words
Calling, definition of term: Calling
calling_pag1.html

Card Catalog >> C Words
Card Catalog, definition of term: Card Catalog
card+catalog_pag1.html

Card Game >> C Words
Card Game, definition of term: Card Game
card+game_pag1.html

Bank Card >> B Words
Bank Card, definition of term: Bank Card
bank+card_pag1.html

Business Card >> B Words
Business Card, definition of term: Business Card
business+card_pag1.html