pediment

Yes, (in temple language) a pediment is the triangular area between the frieze and the roof. I suspected that it was so named because that's the area where relief sculptures were generally placed and the feet of the sculptures would be on the bottom of the pediment. Also, in Etruscan temples, statues were placed on the roof, so their feet would be on top of the pediment.

Apparently, this is wrong. M-W says that it's an alteration of periment, which is possibly derived from pyramid.