1 (number)

: This article discusses the number one. For the year AD 1, see 1. For other uses of 1, see 1 (disambiguation)

In other fields

One is:

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• the denomination of U.S. dollar bill with George Washington's portrait, and the denomination of coin with Sacagawea's portrait.
• the denomination of Canadian dollar coin with a swimming loon on the reverse, hence its universally employed nickname, the "loonie"
• in cents of a U.S. dollar, the denomination of coin with Abraham Lincoln's portrait.
• in cents of a Canadian dollar, the denomination of coin with two maple leaves on the reverse, commonly known as a penny.
• the code for international direct dial phone calls to countries participating in the North American Numbering Plan, such as the United States and Canada.
• the designation of many roads, listed at Route 1.
• as Air Force One is the callsign of any United States Air Force aircraft carrying the President of the United States.
• the house number of Number One Observatory Circle, the US Vice-President's residence.
• the address of Apsley House, known simply as Number 1, London.
• a subway service in New York City. See 1 (New York City Subway service).
• the name of a train operating company in East Anglia, England. See: 'one'
• an enneagram personality type.
• part of a nickname for the U. S. Army's First Infantry Division, "The Big Red One".
• as a word in all capitals, ONE, a trademark of Nestlé Purina PetCare for a line of pet food products (acronym for the "optimum nutritional effectiveness" they are claimed to possess).
• as ONE, the self-referential acronym for ONE North East, the regional development agency in North East England.
• in Astrology, Aries is the 1st astrological sign of the Zodiac.
• the number of syllables in a monosyllabic word.
• the number of humps on a dromedary.
• the number of wheels on a unicycle.
• the number of players in solitaire.
• the year A.D. 1 or the immediately previous year 1 B.C., or the year 1 in a century.