CubeSat, a nice 100 x 100 x 100 mm 'in the box' type device. So what's the Payload (100 x 100 x 50 mm) called ? 1/2 CubeSat doesn't work, it's not a satellite. 1/2 CubePayload sounds like too many syllables. 1/2 CubePay sounds expensive. 1/2 CubeLuna, not. Maybe 1/2 CubePlat. Platform. Reasonable. So when it needs to be twice as long? 1/2 CubePlat DL (double length) or 2U?

Some Spacecraft (Rover) designs appear to be CubeRover size [plus wheels]. It will be interesting how well they, being as small as 3/4 the size of three Payloads combined, will perform on the Moon's surface.