The term 'Chess Pieces' refers to the 16 pieces used in a game of chess. These pieces include the King, Queen, Rooks, Bishops, Knights, and Pawns. The King is the most important piece and is the only one that can move in any direction. The Queen is the most powerful piece and can move in any direction. The Rooks are the castle-like pieces that can move horizontally or vertically. The Bishops are the pieces that can move diagonally. The Knights are the horse-shaped pieces that can move in an L-shape. Finally, the Pawns are the weakest pieces and can only move forward one square at a time.