janus

noun

1. (Roman mythology) the Roman god of doorways and passages; is depicted with two faces on opposite sides of his head
   Terjemahkan ke Indonesia sumber: wordnet30
2. 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.
   Terjemahkan ke Indonesia sumber: webster1913