The term 'Playing-Card Spots' refers to the small symbols found on the face of playing cards. These symbols, known as PIPS, are typically found in four suits: hearts, diamonds, clubs, and spades. Each suit has a distinct pattern of PIPS, which can range from one to four. The number of PIPS in each suit is determined by the rank of the card, with aces having one pip, kings having four, and all other cards having two or three. The PIPS are used to identify the card's rank and suit, making them an essential part of any deck of playing cards.