Janus

Etymology and Mythology

Janus is a term with multiple meanings and references. In Roman mythology, Janus is a god with one head but two opposing faces, guardian of passages and crosses, divinity of change, of transition, to which January is consecrated. The temple of Janus is a symbol of military engagement, where its doors being open signified war and closed signified peace.

Namesakes

### People

* Jill Janus (1975-2018), American heavy metal singer
* Janus de Lusignan (1398-1432), king of Cyprus
* Janus Pannonius (1434-1472), Croatian and Hungarian humanist
* Janus Bey, Drogman of Soliman the Magnificent
* Janus Dousa (1545-1604), Dutch magistrate, warrior, and reader
* Janus La Cour (1837-1909), Danish painter

### Places

* Mount Janus near Briançon, where Maginot du Janus is located, dug himself under Fort Séré de Rivières of the same name.
* Fountain of Janus in Strasbourg, erected in 1988.

Astronomy and Space Exploration

Janus is one of Saturn's moons. It was discovered in 1966 by a team of astronomers led by Audouin Dollfus.

Computer Science and Technology

### File Transfer Protocol (FTP)

Janus protocol is a file transfer protocol used for transferring files over computer networks.

### Security

* Janus attack, also known as Man-in-the-middle attack, is a form of attack on a computer network.
* Janus Recognition Toolkit is a software tool used for facial recognition and biometric identification.

Music and Arts

### Bands

* Janus (progressive rock band), an English band from the early 1970s
* Janus (band), a German band
* Schempp-Hirth Janus, a sailplane of Schempp-Hirth
* Zündapp Janus, a car from Zündapp – with Janus seat format

### Chess Variants

* Fairytale chess #Janus, a character in chess variants
* Janusschach, a chess variant

Other References

* HMS Janus, a British warship in World War II
* Janus Capital Group, an investment company from the United States
* Janus II, a French diving company
* Arc de Janus, a monument in Rome
* Temple of Janus, a symbol of military engagement in ancient Rome.

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