Duplo 1x2 (half brick)
I was missing this part from Duplo from the beginning.
I use this design as a test piece instead of 3DBenchy. Mostly for testing new materials and accuracy, so I have a lot of this laying around.
CHOCKING HAZARD! This part is not intended to be played for children under age 3. This part is much smaller than regular Duplo pieces, thus can be swallowed and will cause choke.