uuu

UUU is an acronym or code that can refer to different things depending on the context. There is no single, universally recognized meaning for UUU, and its interpretation is usually clarified by accompanying information such as the subject area, organization, or geographic region.

In chemistry and the history of chemical elements, Uuu has appeared as the temporary systematic symbol for element 111, later named unununium. In early literature, this symbol was often written as Uuu, though some texts render it in all caps as UUU. Element 111 was first synthesized in 1994 by a team at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt and was formally named roentgenium (Rg) in 2004 by IUPAC.

Beyond chemistry, UUU is used as a three-letter abbreviation in various domains to denote organizations, universities, projects, or codes. Because it is not unique, its precise meaning relies on the context in which it appears, and it may require disambiguation to avoid confusion.

See also references to similarly structured abbreviations or to disambiguation pages for other three-letter combinations. In practice, when encountering UUU, readers should look for clarifying information such as the field, locale, or the full name of the entity to determine the intended meaning.