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 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.
Ariana Grande-Butera (; born June 26, 1993) is an American singer, songwriter and actress. One of the world's leading contemporary recording artists, she is known for her wide vocal range and has received various accolades, including one Grammy Award, one Brit Award and three American Music Awards.
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.
In computer science, artificial intelligence (AI), sometimes called machine intelligence, is intelligence demonstrated by machines, in contrast to the natural intelligence displayed by humans and animals.
Architecture is both the process and the product of planning, designing, and constructing buildings or any other structures.
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.