JANUS
Janus
(noun) (Roman mythology) the Roman god of doorways and passages; is depicted with two faces on opposite sides of his head
Source: WordNet® 3.1
Ja"nus, n. Etym: [L. See January.] (Rom. Antiq.)
Definition: A Latin deity represented with two faces looking in opposite
directions. Numa is said to have dedicated to Janus the covered
passage at Rome, near the Forum, which is usually called the Temple
of Janus. This passage was open in war and closed in peace. Dr. W.
Smith. Janus cloth, a fabric having both sides dressed, the sides
being of different colors, -- used for reversible garments.
Source: Webster’s Unabridged Dictionary 1913 Edition