Proper noun
(education) Initialism of University of the Arts London.
(aviation) Initialism of United Airlines.
Source: en.wiktionary.orgICAO also assigns 3-letter airline codes (versus the more-familiar 2-letter IATA codes—for example, UAL vs. UA for United Airlines ). Source: Internet
UAL sold or spun off most of its assets not related to its core airline operations during the 1980s and '90s. Source: Internet
United was previously known as United Air Lines (UAL). Source: Internet