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Posted By: davidcycleback

By the definition of the single word 'card,' the following things are cards.

business card
Those annoying cards that fall out of magazines
Christmas card
Square piece of blank heavy paper that was left over when I cut something on my papercutter
AOL junk mail ad card I received in my mail box
credit card
YMCA memebership card

These are all cards and they can all be collected, but that doesn't make them all trading cards. Baseball card, as it is used in the baseball card hobby, is short for 'baseball trading card.' The Gibson postcard is a fine and dandy item and it is literally a card (post card, rectangular piece of heavy paper), but it isn't a baseball trading card.