visiting card

from The Century Dictionary.

• noun A small card, bearing one's name, and sometimes an address, an official title, or the like, to be left in making calls or paying visits, or, upon occasion, to be sent as an act of courtesy or in acknowledgment of an attention.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A written card which identifies the bearer, presented for introduction when attending a business meeting or formal social gathering.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a printed or written greeting that is left to indicate that you have visited