201 (two hundred ndone) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called '' cardinal ...

following

200 __NOTOC__ Year 200 ( CC) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Victorinus (or, less frequently, year 953 ''Ab u ...

and preceding 202.

In mathematics

As the two proper factors of 201 are both

Gaussian prime In number theory, a Gaussian integer is a complex number whose real and imaginary parts are both integers. The Gaussian integers, with ordinary addition and multiplication of complex numbers, form an integral domain, usually written as \mathb ...

s, 201 is a

Blum integer In mathematics, a natural number ''n'' is a Blum integer if is a semiprime for which ''p'' and ''q'' are distinct prime numbers congruent to 3 mod 4.Joe Hurd, Blum Integers (1997), retrieved 17 Jan, 2011 from http://www.gilith.com/research/talks/ ...

In computing

201 Year 201 ( CCI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Fabianus and Arrius (or, less frequently, year 954 ''Ab urbe condit ...

is an

HTTP The Hypertext Transfer Protocol (HTTP) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web, ...

status code indicating a new resource was successfully created in response to the request, with the textual part of the response line indicating the

URL A Uniform Resource Locator (URL), colloquially termed as a web address, is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifi ...

of the newly created document.

In astronomy

* 201 is a

Saros cycle The saros () is a period of exactly 223 synodic months, approximately 6585.3211 days, or 18 years, 10, 11, or 12 days (depending on the number of leap years), and 8 hours, that can be used to predict eclipses of the Sun and Moon. One saros perio ...

; the next solar eclipse in this cycle is predicted to take place in AD 322

* The New General Catalogue object

NGC201 NGC commonly refers to: * New General Catalogue of Nebulae and Clusters of Stars, a catalogue of deep sky objects in astronomy NGC may also refer to: Companies * NGC Corporation, name of US electric company Dynegy, Inc. from 1995 to 1998 * Nati ...

is a magnitude 15

spiral galaxy Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''Cetus

*

201 Penelope Penelope (minor planet designation: 201 Penelope) is a large Asteroid belt, main belt asteroid that was discovered by Austrian astronomer Johann Palisa on August 7, 1879, in Pula, Pola. The asteroid is named after Penelope, the wife of Odysseus in ...

is a large

Main belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid An asteroid is a minor planet of the Solar System#Inner solar system, inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic o ...

discovered in

1879 Events January–March * January 1 – The Specie Resumption Act takes effect. The United States Note is valued the same as gold, for the first time since the American Civil War. * January 11 – The Anglo-Zulu War begins. * Janu ...

In other fields

* A

201 file :''See " service record" for other countries version of the personnel file'' A military personnel file (also called a 201 file in the United States Army) is a set of documents maintained by the US government for members of the United States armed fo ...

is the term used in the U.S. Army for the set of documents maintained by the US government for members of the Armed Forces recording their service history. It is also referred to as the Official Military Personnel File. * 201 in binary (

11001001 "11001001" is an episode of the first season of the American science fiction television series '' Star Trek: The Next Generation''. It was first broadcast on February 1, 1988, in the United States in broadcast syndication. It was written by Ma ...

) is the title of an episode of '' Star Trek: The Next Generation''. *

Area code 201 Area codes 201 and 551 are telephone area codes in the North American Numbering Plan in the U.S. State of New Jersey. Area code 201 was the area code assigned to the entire state of New Jersey in 1947, when the North American area code system ...

is the area code assigned to northern

New Jersey New Jersey is a U.S. state, state in the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. It is bordered on the north and east by the state of New York (state), New York; on the ea ...

in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...

. * 201 is the course number of basic or entry-level courses at some

Canadian Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...

universities (such as the

University of Calgary The University of Calgary (U of C or UCalgary) is a public research university located in Calgary, Alberta, Canada. The University of Calgary started in 1944 as the Calgary branch of the University of Alberta, founded in 1908, prior to being inst ...

and

Athabasca University Athabasca University (AU) is a Canadian public research university that primarily operates through online distance education. Founded in 1970, it is one of four comprehensive academic and research universities in Alberta, and was the first ...

), especially if the number

101 101 may refer to: * 101 (number), the number * AD 101, a year in the 2nd century AD * 101 BC, a year in the 2nd century BC It may also refer to: Entertainment * ''101'' (album), a live album and documentary by Depeche Mode * "101" (song), a ...

is allocated to remedial courses. * 201 is also short for

201 Poplar 201 Poplar Avenue is the street address for the Walter L. Bailey, Jr. Criminal Justice Center in Memphis, Tennessee. It is alluded to in many rap songs by artists hailing from Memphis. The Complex houses several courts, including General Sessions C ...

, the jail in

Memphis Memphis most commonly refers to: * Memphis, Egypt, a former capital of ancient Egypt * Memphis, Tennessee, a major American city Memphis may also refer to: Places United States * Memphis, Alabama * Memphis, Florida * Memphis, Indiana * Memp ...

Tennessee Tennessee ( , ), officially the State of Tennessee, is a landlocked state in the Southeastern region of the United States. Tennessee is the 36th-largest by area and the 15th-most populous of the 50 states. It is bordered by Kentucky to ...

, and alluded to in many rap songs from Memphis artists. * in Philippine employment, a

is a file detailing an employee's history and records with a particular employer *The 201 Class diesel locomotive used by

Iarnród Éireann Iarnród Éireann () or Irish Rail, is the operator of the national Rail transport in Ireland, railway network of Ireland. Established on 2 February 1987, it is a subsidiary of CIÉ, Córas Iompair Éireann (CIÉ). It operates all internal In ...

and

NI Railways NI Railways, also known as Northern Ireland Railways (NIR) ( ga, Iarnród Thuaisceart Éireann); and for a brief period Ulster Transport Railways (UTR), is the railway operator in Northern Ireland. NIR is a subsidiary of Translink, whose paren ...

. * The

201 series 1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length 1. I ...

is a Japanese commuter train type * The

EMI EMI Group Limited (originally an initialism for Electric and Musical Industries, also referred to as EMI Records Ltd. or simply EMI) was a British transnational conglomerate founded in March 1931 in London. At the time of its break-up in 2012, ...

201 television camera use in the 1960s * "

" is the title of an episode of '' South Park''. *

Event 201 The Johns Hopkins Center for Health Security (abbreviated CHS) is an independent, nonprofit organization of the Johns Hopkins Bloomberg School of Public Health. The center works to protect people's health from epidemics and pandemics and ensure ...

, a pandemic exercise {{Integers, 2 Integers