Markings in the upper left and lower right corners of a playing card that indicate the card's number value and suit.
EXAMPLE: "Most professional card players will try to protect their cards by lifting them enough only to look at the index rather than looking at the entire card."
APPLIES TO: Online and Land-based Venues
RELATED TERMS: Protect, Spot
Any mark added to the back or edge of a card for the purpose of unfairly identifying it
EXAMPLE: "I suspected one of my opponents was cheating, and this was confirmed when we discovered that many of the high cards had indexes on them."
APPLIES TO: Land-based Venues
To mark the back or edge of a card for the purpose of identifying it in future hands.
EXAMPLE: "I've never seen anyone indexing a card, but I really wouldn't even know what to look out for. I try to play only in reputable establishments that have enough security and surveillance so that I don't need to worry about it too much."