In Minecraft, players use a set of three coordinates (X, Y, and Z) to specify a position in the game world. The X-axis represents the longitude in the world, indicating the players distance east or west of the origin point. The Z-axis represents the latitude in the world, indicating the players distance north or south of the origin point. The Y-axis determines the players position up or down in the world, with a positive value increasing the players position upward and a negative value increasing the players position downward.

Player X and player Z are simply the X and Z coordinates of a players position in the game world. These coordinates can be written as either absolute or relative positions. Absolute coordinates are measured from the worlds origin point (0, 0, 0), while relative coordinates are centered on the players current position, where the origin is the players current location in the game. Minecraft players are two blocks tall, so (~0, ~0, ~0) represents the players feet and (~0, ~1, ~0) represents the players head.