The sets that indicate what a player knows when it is the player's turn to make a move in a game tree are called information sets.

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This statement is true. Information sets are used in game theory to represent the knowledge that a player has at a given point in a game tree. When it is the player's turn to make a move, the information set represents all the possible choices that the player has, based on the information available to them. The information set includes all the nodes in the tree where the player has an equivalent set of possible moves, based on the information available to them.

The Sets That Indicate What a Player Knows When It