Duo may refer to:
The duodecimal system (also known as base 12 or dozenal) is a positional notation numeral system using twelve as its base.
Duolingo (/ˌdjuːoʊˈlɪŋɡoʊ/ DEW-oh-LING-goh) is a free language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam.
The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds.
A duopoly (or twinstick, referring to "stick" as jargon for a radio tower) is a situation in television and radio broadcasting in which two or more stations in the same city or community share common ownership.
The duodenal switch (DS) procedure, also known as biliopancreatic diversion with duodenal switch (BPD-DS) or gastric reduction duodenal switch (GRDS), is a weight loss surgery procedure that is composed of a restrictive and a malabsorptive aspect.
Duodenal atresia, also known as duodenojejunal atresia, is the congenital absence or complete closure of a portion of the lumen of the duodenum.
The duocarmycins are members of a series of related natural products first isolated from Streptomyces bacteria in 1988. They are notable for their extreme cytotoxicity and thus represent a class of exceptionally potent antitumour antibiotics.
The Cathedral of Barcellona Pozzo di Gotto or Duomo of Saint Sebastian or Duomo of Barcellona Pozzo di Gotto, exact full name Minor Basilica of Saint Sebastian, is in Piazza Duomo and the main façade faces in Roma Street.
Duo Caron is a classical music group who transcribed and performed great orchestral works for two pianos and piano four hands.