Reichenbach is a crater in the rugged southeastern part 's near side. It is located to the west-northwest of the prominent crater Stevinus, and to the west of Snellius. The rugged rim of this crater has been heavily worn by impact erosion. The rim is wider along the northern side, and has a slightly distorted appearance. (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.