AR, Ar, or A&R may refer to:
An arthropod (from Greek ἄρθρον arthron, "joint" and πούς pous, "foot") is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages (paired appendages).
Argentina (; Spanish: [aɾxenˈtina]), officially the Argentine Republic (Spanish: República Argentina), is a federal republic in the southern portion of South America.
Arabic (Arabic: العَرَبِيَّة, al-ʻarabiyyah [ʔalʕaraˈbijja] or Arabic: عَرَبِيّ ʻarabī [ˈʕarabiː] or [ʕaraˈbij]) is a Central Semitic language complex that first emerged in Iron Age northwestern Arabia and is now the lingua franca of the Arab world.
Arnold Alois Schwarzenegger (; German: [ˈaɐ̯nɔlt ˈalɔʏs ˈʃvaɐ̯tsn̩ˌɛɡɐ]; born July 30, 1947) is an Austrian-American actor, producer, businessman, investor, author, philanthropist, activist, politician, and former professional bodybuilder.
Artificial intelligence (AI) is intelligence exhibited by machines. In computer science, the field of AI research defines itself as the study of "intelligent agents": any device that perceives its environment and takes actions that maximize its chance of success at some goal.
Arizona () (Navajo: Hoozdo Hahoodzo [xòːztò xɑ̀xòːtsò]; O'odham: Alĭ ṣonak [ˡaɺi ˡʂonak]) is a state in the southwestern region of the United States.
The Armenian Genocide (Armenian: Հայոց ցեղասպանություն, Hayots tseghaspanutyun), also known as the Armenian Holocaust, was the Ottoman government's systematic extermination of 1.5 million Armenians, mostly Ottoman citizens within the Ottoman Empire and its successor state, the Republic of Turkey.
Architecture (Latin architectura, from the Greek ἀρχιτέκτων arkhitekton "architect", from ἀρχι- "chief" and τέκτων "builder") is both the process and the product of planning, designing, and constructing buildings and other physical structures.