Loop or LOOP may refer to:

Brands and enterprises

Loop (mobile) Loop or LOOP may refer to: Brands and enterprises * Loop (mobile), a Bulgarian virtual network operator and co-founder of Loop Live * Loop, clothing, a company founded by Carlos Vasquez in the 1990s and worn by Digable Planets * Loop Mobile, an ...

, a Bulgarian virtual network operator and co-founder of Loop Live * Loop, clothing, a company founded by Carlos Vasquez in the 1990s and worn by Digable Planets * Loop Mobile, an Indian mobile phone operator * Loop Internet, an internet service provider in Pennsylvania, United States * Loop, a reusable container program announced in 2019 by TerraCycle

Geography

* Loop, Germany, a municipality in Schleswig-Holstein * Loop (Texarkana), a roadway loop around Texarkana, Arkansas, United States * Loop, Blair County, Pennsylvania, United States * Loop, Indiana County, Pennsylvania, United States * Loop, West Virginia, United States * Loop 101, a semi-beltway of the Phoenix Metropolitan Area * Loop 202, a semi-beltway of the Phoenix Metropolitan Area * Loop 303, a semi-beltway of the Phoenix Metropolitan Area *

Chicago Loop The Loop is Chicago's central business district and one of the city's 77 municipally recognized Community areas in Chicago, community areas. Located at the center of downtown Chicago on the shores of Lake Michigan, it is the second-largest busi ...

, the downtown neighborhood of Chicago bounded by the elevated railway The Loop ** Loop Retail Historic District, a shopping district in the Chicago Loop *

Delmar Loop The Delmar Loop, often referred to by St. Louis residents simply as The Loop, is an entertainment, cultural and restaurant district in University City, Missouri and the adjoining western edge of St. Louis near Washington University in St. Lou ...

, an entertainment district in St. Louis, Missouri *

London Outer Orbital Path The London Outer Orbital Path—more usually the "London LOOP"—is a 150-mile (242 km) signed walk along Rights of way in England and Wales, public footpaths, and through parks, woods and fields around the edge of Outer London, Englan ...

(LOOP), a signed walk around the edge of Outer London, England * Louisiana Offshore Oil Port (LOOP), a deep-water port in the Gulf of Mexico off the coast of Louisiana

People

* Call Me Loop (born 1991), English singer and songwriter * Liza Loop (active from 1975), American technology pioneer * Uno Loop (1930–2021), Estonian singer, musician, athlete, actor, and educator * Victoria Loop, brass and guitar player with English band

Half Man Half Biscuit Half Man Half Biscuit are an English rock band, formed in 1984 in Birkenhead, Merseyside. Known for their satirical, sardonic, and sometimes surreal songs, the band comprises lead singer and guitarist Nigel Blackwell, bassist and singer Neil Cr ...

* Steven Tyler Loop, American football player

Arts, entertainment, and media

Film

* ''Loop'' (1991 film), a British romantic comedy * ''Loop'' (1999 film), a Venezuelan film * ''Loop'' (2020 film), an American animated short * Film loop, the slack portion of the film around the projector lens in a

movie projector A movie projector (or film projector) is an optics, opto-mechanics, mechanical device for displaying Film, motion picture film by projecting it onto a movie screen, screen. Most of the optical and mechanical elements, except for the illuminat ...

* Porn loop, an 8 or 16 mm video "short" of a pornographic nature that could be purchased from men's magazines starting in the 1950s

Music

Groups

* Loop (band), a London rock band

Other uses in music

* ''Loop'' (album), a 2002 album by Keller Williams * Loop (music), a finite element of sound which is repeated by technical means * "Loop" (Maaya Sakamoto song), 2005 * "Loop" (Sarah Bonnici song), the entry for Malta in the Eurovision Song Contest 2024 * ''Loop'', a 2020 mini-album by Peakboy

Other uses in arts, entertainment, and media

* ''Loop'' (novel), a novel in the ''Ring'' series by Koji Suzuki * LOOP Barcelona, an annual meeting point for video art in Barcelona, Spain

Computing and technology

* Loop (computing), a method of control flow in computer science *

LOOP (programming language) LOOP is a simple register language that precisely captures the primitive recursive functions. The language is derived from the counter-machine model. Like the counter machines the LOOP language comprises a set of one or more unbounded ''regis ...

, the pedagogical primitive recursive programming language with bounded loops * Loop (telecommunication), sending a signal on a channel and receiving it back at the sending terminal * Audio induction loop, an aid for the hard of hearing *

Local loop In telephony, the local loop (also referred to as the local tail, subscriber line, or in the aggregate as the last mile) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the co ...

, the physical link in telephony that links the customer premises to the telephone company (telco) * Loop device, a Unix device node that allows a file to be mounted as if it were a device * LOOPS, the object system for

Interlisp Interlisp (also seen with a variety of capitalizations) is a programming environment built around a version of the programming language Lisp. Interlisp development began in 1966 at Bolt, Beranek and Newman (renamed BBN Technologies) in Cambridge, ...

-D * ''continue'' statement (in some languages ''skip'', ''cycle'', ''next'', ''loop'', or ''iterate''), a structured control statement that skips ahead to the next iteration of the loop containing it * Microsoft Loop, collaborative software

Mathematics

* Loop (algebra), a quasigroup with an identity element *

Loop (graph theory) In graph theory, a loop (also called a self-loop or a ''buckle'') is an edge that connects a vertex to itself. A simple graph contains no loops. Depending on the context, a graph or a multigraph may be defined so as to either allow or disal ...

, an edge that begins and ends on the same vertex *

Loop (topology) In mathematics, a loop in a topological space is a continuous function from the unit interval to such that In other words, it is a path whose initial point is equal to its terminal point.. A loop may also be seen as a continuous map from t ...

, a path that starts and ends at the same point, possibly reduced to a single point

Sports

* Aerobatic loop, a type of

aerobatic maneuver Aerobatic maneuvers are flight paths putting aircraft in unusual attitudes, in air shows, dogfights or competition aerobatics. Aerobatics can be performed by a single aircraft or in Formation flying, formation with several others. Nearly all a ...

Ground loop (aviation) In aviation, a ground loop is a rapid rotation of a fixed-wing aircraft in the horizontal plane (Yaw_(rotation), yawing) while on the ground. Aerodynamic forces may cause the advancing wing to rise, which may then cause the other wingtip to touc ...

, a rapid horizontal (yawing) rotation of a fixed-wing aircraft used in emergencies to bleed of energy while landing * Loop, a type of canoe freestyle maneuver * Loop (cricket), an aspect of bowling in cricket * Loop jump, a figure skating jump * Loop, a type of offensive shot in table tennis

Roller coasters

* Loop (roller coaster), a basic roller coaster inversion * Pretzel loop, a roller coaster element

Transportation

* ''Loop'' (Amtrak train), a discontinued Amtrak train *

The Loop (CTA) The Loop (historically Union Loop) is the circuit of elevated rail that forms the hub of the Chicago "L" system in the United States. As of April 2024, the branch served 40,341 passengers on an average weekday. The Loop is so named because the e ...

, a rapid transit section bounding Chicago's Loop neighborhood * Loop, underground public transportation system of The Boring Company in Tesla cars, including a proposed DC-to-Baltimore system *

Balloon loop A balloon loop, turning loop, or reversing loop ( North American Terminology) allows a rail vehicle or train to reverse direction without having to shunt or stop. Balloon loops can be useful for passenger trains and unit freight trains. Bal ...

, a section of track that allows reversal of direction without stopping * Circle route, a public transport route that travels around and connecting the peripheral zones of an area. * Loop line (railway), a branch line that deviates from a direct route and rejoins it at another location * Loop route, a main route or highway that forms a closed loop *

Passing loop A passing loop (UK usage) or passing siding (North America) (also called a crossing loop, crossing place, refuge loop or, colloquially, a hole) is a place on a single line railway or tramway, often located at or near a station, where trains o ...

, a short section of track that allows trains to pass on a single track route *

Ring road A ring road (also known as circular road, beltline, beltway, circumferential (high)way, loop or orbital) is a road or a series of connected roads encircling a town, city or country. The most common purpose of a ring road is to assist in reducin ...

or loop, a main route or highway that encircles a town or city * Spiral (railway), a section of track that allows a train to climb a steep hill

Other uses

* Compulsion loop, a habitual chain of activities that will be repeated by the user to cause them to continue the activity * Loop (biochemistry), a flexible region in a protein's secondary structure *

Loop (education) Looping in education is the practice of moving groups of children up from one Educational stage, grade to the next with the same teacher. For example, a teacher who teaches a third grade class and then goes on to teach the same students, the follow ...

, the process of advancing an elementary school teacher with his or her class * Loop (knot), one of the fundamental structures used to tie knots * Loop, the end of some dead-end streets * Loop, a type of

fingerprint A fingerprint is an impression left by the friction ridges of a human finger. The recovery of partial fingerprints from a crime scene is an important method of forensic science. Moisture and grease on a finger result in fingerprints on surfa ...

pattern