Res Extensa

René Descartes used the term res extensa and its opposite res cogitans in his philisophical system called the Cartesian system. Res extensa was used to denote the physical world and res cogitans was used to denote the human soul and God.

See also:

Philisophical Dualism

References:

http://radicalacademy.com/phildescartes2.htm

http://www.swif.uniba.it/lei/foldop/foldoc.cgi?res+cogitans+-+res+extensa