AR, Ar, or A&R may refer to:
An arthropod (from Greek arthro-, joint + podos, foot) is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages (paired appendages).
Argentina (/ˌɑːrdʒənˈtiːnə/; Spanish: [aɾxenˈtina]), officially the Argentine Republic (Spanish: República Argentina), is a federal republic in the southern half of South America.
Arabic (Arabic: العَرَبِيَّة, al-ʻarabiyyah [ʔalʕaraˈbij.ja] or Arabic: عَرَبِيّ ʻarabī [ˈʕarabiː, ʕaraˈbij]) is a Central Semitic language that was first spoken in Iron Age northwestern Arabia and is now the lingua franca of the Arab world.
Arnold Alois Schwarzenegger (/ˈʃwɔːrtsənˌɛɡər/; 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.
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.
Arizona (/ɛərᵻˈzoʊnə, ærᵻ-/) (Navajo: Hoozdo Hahoodzo [xòːztò xɑ̀xòːtsò]; O'odham: Alĭ ṣonak [ˡaɺi ˡʃonak]) is a state in the southwestern region of the United States.
The United States Air Force facility commonly known as Area 51 is a highly classified remote detachment of Edwards Air Force Base, within the Nevada Test and Training Range.
Aristotle (/ˈærɪˌstɒtəl/; Greek: Ἀριστοτέλης, pronounced [aristotélɛːs], Aristotélēs; 384–322 BC) was an ancient Greek philosopher and scientist born in the city of Stagira, Chalkidice, on the northern periphery of Classical Greece.