Represents an object located or facing in the down (z - 1) direction.
Represents an object located or facing in the east (x + 1) direction.
Represents an object located or facing in the north (z - 1) direction.
Represents an object located or facing in the south (z + 1) direction.
Represents an object located or facing in the up (z + 1) direction.
Represents an object located or facing in the west (x - 1) direction.
Represents a direction for expressing relative position or facing.