All articles starting with L

Line graph

The line graph, also called the edge graph or interchange graph, is a graph whose vertices correspond to the edges of a graph G, joined when they share an endpoint.

Line infantry

Line infantry was a rigid formation that became obsolete in the mid-19th century due to rifled muskets, but the British Army still uses the distinction for ceremonial purposes.

Line integral

A line integral, also called a curve integral, is an integral of a function evaluated along a curve in a plane or in space rather than along an axis.

Line intensity mapping (LIM) is an observational technique that maps integrated spectral-line emission from unresolved galaxies and the diffuse intergalactic medium, tracing large-scale structure across nearly the universe's entire history.

Line Islands

Line Islands: central Pacific coral atoll chain south of Hawaii; 8 of 11 atolls belong to Kiribati, 3 (Kingman Reef, Palmyra Atoll, Jarvis Island) are US territories; Kiritimati is the world's largest atoll.

Line level

Line level is the nominal signal strength used to carry audio between components like mixers and amplifiers, at +4 dBu professional or −10 dBV consumer level.

LINE MAN

LINE MAN is a Thai on-demand services app launched by LINE Corporation, offering food and grocery delivery, taxi, and messenger services; it merged with Wongnai in 2020.

LINE Music

LINE Music is a Japanese subscription music streaming service launched by LINE Corporation in 2015, available only in Japan and known for sharing songs in LINE chats.

Line of action

The line of action, also called the pressure line or generating line, is the common normal to two meshing gear teeth at their point of contact.

Line of Actual Control

The Line of Actual Control is the de facto military boundary between Indian- and Chinese-controlled territory in the Himalayas, never demarcated, which emerged from the 1962 Sino-Indian War.

Line of balance

Line of balance is a graphical scheduling method for repetitive work, such as housing projects and high-rise floors, in which each trade is a sloped line showing its production rate.

Line of Control

Line of Control (LoC), the 740 km military line dividing Jammu and Kashmir between Indian and Pakistani administration; created from the 1949 ceasefire line, renamed under the 1972 Simla Agreement, ending at NJ9842 near Siachen.

Line of credit

A line of credit is a pre-approved borrowing arrangement letting a borrower draw, repay, and redraw funds up to a set limit, paying interest only on amounts outstanding.

Line of Duty

Line of Duty: BBC police procedural created by Jed Mercurio, first aired 2012, 36 episodes over six series, following fictional anti-corruption unit AC-12; a seventh series is in post-production.

Line of Fire (2026 TV series)

Line of Fire (formerly Protection) is a 2026 NBC crime drama created by Joshua Safran, starring Peter Krause and Hope Davis as parents in a family of federal agents across the FBI, Marshals, Secret Service, and DOJ, airing Mondays and streaming on Peacock.

Line of scrimmage

The line of scrimmage, also called the scrimmage line, is the plane through the ball in gridiron football from which the offense advances and the defense may not cross before the snap.

Line Operations Safety Audit

The Line Operations Safety Audit (LOSA) is a voluntary, non-punitive observational program in which trained peer observers ride flight decks and record how airline crews manage threats and errors.

Line pack

Line pack, also written linepack, is gas stored within a pipeline at pressure and released by pressure reduction when demand exceeds supply, giving gas networks built-in short-term storage that electricity lines lack.

Line probe assay

A line probe assay (LPA) is a nucleic acid test that amplifies DNA by multiplex PCR and detects it on a membrane strip, used for tuberculosis drug-resistance testing.

Line profile analysis

Line profile analysis (LPA, XLPA for the X-ray version) is a diffraction method that extracts crystallite size, microstrain, and dislocation density from diffraction peak shapes rather than peak positions.

Line search

A line search is a subroutine in numerical optimization that picks how far to step along a search direction, using conditions such as Armijo or Wolfe.

Line segment

A line segment, also called a straight-line segment, is the finite part of a straight line between two endpoints, distinguished from lines and rays by having two endpoints.

Line segment detector

A line segment detector is a computer vision algorithm that finds straight contours in images; the best-known example is LSD, a linear-time, parameter-free method published in 2009.

Line shaft

A line shaft, also called line shafting, is a long rotating overhead shaft whose pulleys and belts carried power from one engine to dozens of factory machines.

LINE SHOPPING

LINE SHOPPING (LINEショッピング) is an online shopping service operated by LY Corporation inside the LINE messaging app, launched in Japan in 2017 and rewarding purchases with LINE Points.

LINE Stickers

LINE Stickers are illustrations or images sent in LINE chats to convey greetings or emotions, sold as themed packs featuring official characters and independent artists' work.

Line transect

Line transect sampling is a survey method for estimating animal population density: observers walk straight lines, record perpendicular distances to detections, and model how detections decline with distance.