Named after Paolo Pizzetti - Italian geodesist (1860-1918).
Pizzetti is a partly eroded lunar impact crater that lies in the southern hemisphere on the far side. It is located due north of the similar-dimensioned Clark, and to the southeast of the large walled plain Milne. Nearly attached to the western rim is the small Tyndall. The crater is named for the Italian astronomer and geodesist Paolo Pizzetti (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.