Actual clay bricks even more so with their imperfect uniformity and consistency.
FWIW, at least here, in construction even the thermal insulation clay blocks (basically, any wall-construction material made from clay, those red blocks :)) is called "bricks".
They are laid exactly like the regular (uniform, filled) bricks, so I would assume that's what's mostly used in construction everywhere even when not going for looks (they are lighter and have better thermal properties).
FWIW, at least here, in construction even the thermal insulation clay blocks (basically, any wall-construction material made from clay, those red blocks :)) is called "bricks".
They are laid exactly like the regular (uniform, filled) bricks, so I would assume that's what's mostly used in construction everywhere even when not going for looks (they are lighter and have better thermal properties).