Shoe (cards) Shoe (cards) A dealing shoe or dealer's shoe is a gaming device, mainly used in casinos, to hold multiple decks of playing cards. The shoe allows for more games to be played by reducing the time between shuffles and less chance of dealer cheating. In some games, such as blackjack (where card counting is a possibility), using multiple decks of cards can increase the house edge. Prior to 1961 in Las Vegas casinos, all blackjack was being dealt from a single deck. John Scarne proposed to the Nevada Gaming Control Board that a state ruling be enacted such that Blackjack
Optical variable device and the angle the OVD is viewed at. Holograms are a type of OVD. Optical variable device An optical variable device or optically variable device (OVD) is an iridescent image that exhibits various optical effects such as movement or color changes. OVDs cannot be photocopied or scanned, nor can they be accurately replicated or reproduced. The OVD is often used as a security device and anti-counterfeiting measure on money, credit cards and government-issued identification cards. OVDs can be created through a combination of printing and embossing. OVDs are based on diffractive optical structures. This gives cards the appearance of having