Arx

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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 (Roman), a Roman citadel, and in particular:
• The northern hump of the two forming the Capitoline Hill 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
• {{ill|Josef Adolph von Arx|ja|ヨーゼフ・アドルフ・フォン・アルクス|pl|Josef Adolph von Arx|ru|Аркс, Йозеф Адольф фон|wikidata|Q4069467}} (1922-1988), mycologist from the Netherlands