Arx, ARX, or ArX may refer to: *

ARX (Algorithmic Research Ltd.) ARX (Algorithmic Research Ltd.) is a digital security company headquartered in San Francisco, CA, with offices in the UK, the Netherlands, Australia and Israel. It is the creator of CoSign single sign on, CoSign by ARX, a digital signature technolo ...

, a digital security company *

ARX (gene) Aristaless related homeobox is a protein that in humans is encoded by the ''ARX'' gene. Function This gene is a homeobox-containing gene expressed during development. The expressed protein contains two conserved domains, a C-peptide (or arist ...

, Aristaless related homeobox *

ARX (operating system) ARX was an unreleased Mach-like operating system written in Modula-2+ developed by Acorn Computers Ltd in the Acorn Research Centre (ARC) United Kingdom (UK) and later by Olivetti - which purchased Acorn - for Acorn's new Archimedes personal c ...

, an operating system * ArX (revision control), revision control software *

Arx (Roman) ''Arx'' is a Latin word meaning "citadel". In the ancient city of Rome, the ''arx'' was located on the northern spur of the Capitoline Hill, and is sometimes specified as the ''Arx Capitolina''. History At Rome, sentries were traditionally pos ...

, a Roman citadel, and in particular: **The northern hump of the two forming the

Capitoline Hill The Capitolium or Capitoline Hill ( ; it, Campidoglio ; la, Mons Capitolinus ), between the Forum and the Campus Martius, is one of the Seven Hills of Rome. The hill was earlier known as ''Mons Saturnius'', dedicated to the god Saturn. ...

of ancient Rome * Arx, Landes, a commune of the Landes ''département'' in France *'' Arx Fatalis'', a first person role-playing game developed by Arkane Studios in 2002 *''Arx'', a sculpture by Lars Vilks * Americas Rallycross Championship, also known as ARX Rallycross *Add-Rotate-XOR; see block cipher

See also