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 Duo LNB is a double low-noise block downconverter (LNB) developed by SES for the simultaneous reception of satellite television signals from both the Astra 23.5°E and Astra 19.2°E satellite positions.
Duolin Station (Chinese: 多林車站; pinyin: Duōlín Chēzhàn) is a railway station on the Taiwan Railways Administration (TRA) Alishan Forest Railway Line located in Alishan Township, Chiayi County, Taiwan.
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 American ensemble Duo46 was established in 1994 in Tucson, Arizona by guitarist Dr. Matthew Gould and violinist Beth Ilana Schneider-Gould Since then, they have emerged through their commissioning, performing around the world, recording and teaching as a leading advocate of contemporary chamber music with guitar (duets, trios and double concertos).
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.
Duopalatinus is a small genus of long-whiskered catfishes native to South America.