(geography, geology, astronomy) An impact feature on Charon, the moon or binary companion of the dwarf planet Pluto.

An effort, an endeavour, a striving. / A force or impulse; a nisus.

(algebra, order theory) A bounded distributive lattice equipped with an involution (typically denoted ¬ or ~) which satisfies De Morgan's laws.

A surname. / A city in Glenn County, California, United States.