Loop

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 Indian mobile phone operator
A reusable container program announced in 2019 by TerraCycle

Loop, Germany, a municipality in Schleswig-Holstein, Germany
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, see Arizona State Route 101, a semi-beltway of the Phoenix Metropolitan Area
Loop 202, see Arizona State Route 202, a semi-beltway of the Phoenix Metropolitan Area
Loop 303, see Arizona State Route 303, a semi-beltway of the Phoenix Metropolitan Area
Chicago Loop, the downtown neighborhood of Chicago bounded by the elevated railway The Loop (CTA)
- Loop Retail Historic District, a shopping district in the Chicago Loop
Delmar Loop, an entertainment district in St. Louis, Missouri
London Outer Orbital Path (or LOOP), a signed walk around the edge of Outer London, England
Louisiana Offshore Oil Port (or LOOP), a deep-water port in the Gulf of Mexico off the coast of Louisiana

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
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

Loop (computing), a method of control flow in computer science
LOOP (programming language), 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, (aka local tail, subscriber line, or the last mile), 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-D

Loop (algebra), a quasigroup with an identity element
Loop (graph theory), an edge that begins and ends on the same vertex
Loop (topology), a path that starts and ends at the same point, possibly reduced to a single point

Loop (Amtrak train), a discontinued Amtrak train
The Loop (CTA), 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 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 short section of track that allows trains to pass on a single track route
Ring road 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

Loop (biochemistry), a flexible region in a protein's secondary structure
Loop (education), 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, a cul de sac
Loop, a type of fingerprint pattern