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) Arx, ARX, or ArX may refer to: *ARX (Algorithmic Research Ltd.), a digital security company *ARX (gene), Aristaless related homeobox *ARX (operating system), an operating system * ArX (revision control), revision control software *Arx (Roman), a R ...

, 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 post ...

, 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. Th ...

of ancient Rome *

Arx, Landes Arx (; oc, Arcs) is a commune of the Landes department in Nouvelle-Aquitaine in southwestern France. Population See also *Communes of the Landes department The following is a list of the 327 communes of the Landes department of France ...

, a commune of the Landes ''département'' in France *''

Arx Fatalis ''Arx Fatalis'' is an action role-playing video game developed by Arkane Studios and released for Microsoft Windows in 2002 and Xbox in 2003. The game is played from a first-person perspective and is set on a world whose sun has failed, forcing t ...

'', a first person role-playing game developed by Arkane Studios in 2002 *''Arx'', a sculpture by

Lars Vilks Lars Endel Roger Vilks (20 June 1946 – 3 October 2021) was a Swedish visual artist and activist who was known for the controversy surrounding his drawings of Muhammad. He also created the sculptures ''Nimis'' and ''Arx'', made of driftwood an ...

Americas Rallycross Championship The Americas Rallycross Championship, also known as ARX Rallycross, was an American rallycross series organized by IMG Motorsport. Formed in 2018, it was a feeder series to the FIA World Rallycross Championship. After two seasons, ARX shut down ...

, also known as ARX Rallycross *Add-Rotate-XOR; see

block cipher In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called ''blocks''. Block ciphers are specified cryptographic primitive, elementary components in the design of many cryptographic protocols and ...