Davisson is a lunar impact crater on the far side from the Earth. This crater lies across the eastern rim of the huge walled plain Leibnitz, and the rim and outer rampart intrudes into the interior floor of Leibnitz. To the east-northeast is the walled plain Oppenheimer, a formation only somewhat smaller than Leibnitz. The rim has been somewhat eroded from impacts, but it retains some detail from its original formation. (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.