The back cubemap face, same as NegativeZ.
The bottom cubemap face, same as NegativeY.
The front cubemap face, same as PositiveZ.
The left cubemap face, same as NegativeX.
The negative X cubemap face.
The negative Y cubemap face.
The negative Z cubemap face.
The positive X cubemap face.
The positive Y cubemap face.
The positive Z cubemap face.
The right cubemap face, same as PositiveX.
The top cubemap face, same as PositiveY.
Different faces of the cubemap that a camera can render into.
Example