Philip mentions the "dado" of an interior wall. This word can have many meanings. I first learned it for a device to make cirular saw tilt on its axle, so that it made a wide
cut.
DADO

In architecture, a dado is that part of a pedestal included between the base and the cornice (or surbase), and in a wall, that part of the basement included between the base and the base course. In interior decoration, the dado is the lower part of the wall of an apartment when adorned with mouldings, or otherwise specially decorated.