Sherrington is a small lunar crater that intrudes into the southwest outer rim of the much larger crater Langemak. To the south-southwest is Kondratyuk. Sherrington is located and it cannot be viewed directly from the Earth. The rim of this crater is elongated along the western side, giving it a slight tear-drop shape. (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.