AR, Ar, or A&R may refer to:
An arthropod (, from Greek ἄρθρον arthron, "joint" and πούς pous, "foot" (gen. ποδός)) is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and paired jointed appendages.
Argentina (Spanish: [aɾxenˈtina]), officially the Argentine Republic (Spanish: República Argentina), is a country located mostly in the southern half of South America.
Arnold Alois Schwarzenegger (; German: [ˈaɐ̯nɔlt ˈʃvaɐ̯tsn̩ˌʔɛɡɐ]; born July 30, 1947) is an Austrian-American actor, filmmaker, businessman, author, philanthropist, activist, politician, and former professional bodybuilder and powerlifter.
Ariana Grande-Butera (; born June 26, 1993) is an American singer, songwriter, and actress. A multi-platinum, Grammy Award-winning recording artist, she is known for her wide vocal range.
Arabic (Arabic: العَرَبِيَّة al-ʻarabiyyah [al.ʕa.ra.ˈbij.ja] (listen), or عَرَبِيّ ʻarabī [ˈʕa.ra.biː] (listen) or [ʕa.ra.ˈbij]) is a Semitic language that first emerged in the 1st to 4th centuries CE.
Architecture is both the process and the product of planning, designing, and constructing buildings or any other structures.
In computer science, artificial intelligence (AI), sometimes called machine intelligence, is intelligence demonstrated by machines, in contrast to the natural intelligence displayed by humans.
Arizona ( (listen); Navajo: Hoozdo Hahoodzo Navajo pronunciation: [xòːztò xɑ̀xòːtsò]; O'odham: Alĭ ṣonak Uto-Aztecan pronunciation: [ˡaɺi ˡʂonak]) is a state in the southwestern region of the United States.