A playing card was a type of card that was marked with symbols that belonged to a deck. A variety of card games could be placed with them. There were fifty-two cards to a standard deck. Cards bearing the face of a figure were known as picture cards.
In 2376, when Harry Kim was navigating through a Borg cube, he used playing cards to mark his path, in case he had to come back the same way. He placed a three of hearts on a transwarp conduit and a nine of diamonds on a data node. Mezoti, found one of the cards, a queen of hearts, and returned to him. (VOY: "Collective")
In 2380, Q set a challenge for the bridge crew of the USS Cerritos by placing them on a giant chess board with elements of several different sports and games. In that challenge, the bridge crew's apparent opponents were playing cards (some of which carried hockey sticks). (LD: "Veritas")
- Cardassian pinochle
- Five-card stud
- Gin rummy
- Go Fish
- Seven-card stud