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 ur ...

and preceding

202 Year 202 ( CCII) was a common year starting on Friday (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 Antoninus (or, less frequently, year 955 '' Ab urbe condi ...

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 \mathbf /ma ...

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/tal ...

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 We ...

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 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 period ...

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

* The New General Catalogue object NGC201 is a magnitude 15 spiral galaxy in the constellation Cetus

* 201 Penelope 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 discovered in 1879.

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 for ...

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) 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 state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...

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 states, a federal district, five major unincorporated territori ...

. * 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 ins ...

and Athabasca University), especially if the number 101 is allocated to remedial courses. * 201 is also short for 201 Poplar, 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 th ...

, 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 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 (Northern Ire ...

. * 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 ...

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 corporation, transnational Conglomerate (company), conglomerate founded in March 1 ...

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 ensures ...

, a pandemic exercise {{Integers, 2 Integers