Arx, ARX, or ArX may refer to: * ARX (Algorithmic Research Ltd.), 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), an operating system *

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 ( ; ; ), between the Roman Forum, 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 (mythology), Saturn. The wo ...

of ancient Rome * Arx, Landes, a commune of the Landes ''département'' in France *''

Arx Fatalis ''Arx Fatalis'' is a 2002 action role-playing game developed by Arkane Studios and released for Windows and Xbox. The game is played from a first-person perspective and is set on a world whose sun has failed, forcing the above-ground creatures t ...

'', 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 In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called ''blocks''. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage a ...

* (1922-1988), mycologist from the Netherlands

See also