Threshold may refer to: *

Threshold (architecture) A threshold is the sill of a door. Some cultures attach special symbolism to a threshold. It is called a door saddle in New England. Etymology Various popular false etymologies of this word exist, some of which were even recorded by dictionar ...

, the sill of a door

Literature

* ''Threshold'' (1990 novel), a science fiction novel by Chris and Janet Morris * ''Threshold'' (Sara Douglass novel), a fantasy novel * ''Threshold'' (Palmer novel), a science fiction novel by David R. Palmer * ''Threshold'', the first volume of the collected short fiction of

Roger Zelazny Roger Joseph Zelazny (May 13, 1937 – June 14, 1995) was an American poet and writer of fantasy and science fiction short stories and novels, best known for ''The Chronicles of Amber''. He won the Nebula Award three times (out of 14 nomin ...

* ''Threshold'' (DC Comics), a comic book published by DC Comics * Threshold (''Doctor Who''), an organization in ''Doctor Who'' comic strips * ''Threshold'', a science-fiction novel by

Caitlín R. Kiernan Caitlín Rebekah Kiernan (born 26 May 1964) is an Irish-born American published paleontologist and author of science fiction and dark fantasy works, including 10 novels, series of comic books, and more than 250 published short stories, novella ...

* ''Threshold'', a Christian novel by

Bill Myers Bill Myers is an American Christian author, film director and film producer. He was born in Seattle, Washington on September 9, 1953. Myers is most notable for the animated series '' McGee and Me!'' He is an author of books from many genres, ...

* ''Threshold'', a science-fiction novel by

Ben Mezrich Ben Mezrich ( ; born February 7, 1969) is an American author. Early life and education Mezrich was born in Boston, Massachusetts, the son of Molli Newman, a lawyer, and Reuben Mezrich, a chairman of radiology at the University of Maryland Schoo ...

Threshold Editions Threshold Editions is an imprint of publishers Simon & Schuster, a division of ViacomCBS, specializing in conservative non-fiction. The publisher is Louise Burke; Mary Matalin was its founding editor-in-chief. Threshold Editions was founded to ...

, a conservative imprint

Media

* ''Threshold'' (1981 film) * ''Threshold'', a 2008 film directed by

Deepak Rauniyar Deepak Rauniyar ( ne, दीपक रौनियार; born on 29 August 1978) is a Nepalese director, writer and producer. He is one of the few internationally acclaimed cinema directors from Nepal. He rose to prominence in 2012 as the direc ...

* ''Threshold'' (TV series), an American science fiction drama TV series * "Threshold" (''Stargate SG-1''), an episode of the TV series * "Threshold" (''Star Trek: Voyager''), an episode of the TV series *

Threshold Entertainment Threshold Entertainment Group, also known as Threshold Entertainment, is an intellectual property company. Its animation subsidiary, Threshold Animation Studios, produces films. Larry Kasanoff is the company's chief executive officer (CEO) after p ...

, a Hollywood Intellectual Property Management and Production Company *

Threshold Podcast ''Threshold'' is a Peabody Award-winning podcast and radio show that tackles one pressing environmental story each season. The podcast explores the intersections of environment, history, culture, science, politics and social justice, focusing on t ...

, a podcast focused on long-form reporting of climate justice topics

Music

Threshold (band) Threshold are an English progressive metal band formed in Surrey in the late 1980s. History 1988–1992 Threshold began their career in 1988, initially playing covers of metal groups like Ratt and Testament. As they continued playing tog ...

, a UK progressive metal band *

Threshold House Threshold House is one of several record labels created by Coil to release their own work and that of affiliated projects. Associated labels include Eskaton and Chalice. It is also the name for the official Coil website. The label was initi ...

, a record label created by Coil *

Threshold Records Threshold Records was a record label created by the rock music group the Moody Blues. The name of the label came from their 1969 album ''On the Threshold of a Dream''. The band formed this label to allow for artistically packaged gatefold covers ...

, a record label created by The Moody Blues

Albums

* ''Threshold'' (album), a 2006 album by HammerFall * ''Thresholds'' (album), a 1992 album by Nocturnus * ''Threshold'', a 1997 album by Erik Norlander

Songs

* "Threshold", by Pocahaunted, 2010 * "Threshold", by Slayer on the album ''

God Hates Us All ''God Hates Us All'' is the ninth studio album by American thrash metal band Slayer, released on September 11, 2001 by American Recordings. It was recorded over three months at The Warehouse Studio in Vancouver, and includes the Grammy Award-nom ...

'', 2001 * "Threshold", by The Steve Miller Band from '' Book of Dreams'', 1977 * "Threshold", by Turnover from ''

Peripheral Vision Peripheral vision, or ''indirect vision'', is vision as it occurs outside the point of fixation, i.e. away from the center of gaze or, when viewed at large angles, in (or out of) the "corner of one's eye". The vast majority of the area in the ...

'', 2015 * "Threshold," from the '' Scott Pilgrim vs. the World soundtrack'', 2010 * "The Threshold", by Connie Smith from ''

Connie Smith Connie Smith (born Constance June Meador; August 14, 1941) is an American country music singer and songwriter. Her contralto vocals have been described by music writers as significant and influential to the women of country music. A similarity h ...

'', 1965

Science

Biology

Threshold (reference value) In medicine and health-related fields, a reference range or reference interval is the range or the interval of values that is deemed normal for a physiological measurement in healthy persons (for example, the amount of creatinine in the blood, o ...

Absolute threshold In neuroscience and psychophysics, an absolute threshold was originally defined as the lowest level of a stimulus – light, sound, touch, etc. – that an organism could detect. Under the influence of signal detection theory, absolute threshold ...

Absolute threshold of hearing The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organis ...

Action potential An action potential occurs when the membrane potential of a specific cell location rapidly rises and falls. This depolarization then causes adjacent locations to similarly depolarize. Action potentials occur in several types of animal cells, ...

Aerobic threshold Lactate inflection point (LIP), is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercisi ...

* Anaerobic threshold *

Dark adaptation threshold {{unreferenced, date=January 2015 Dark Adaptation Threshold (DAT) is a Visual perception, vision test that measures the adjustment of the eye occurring under low levels of illumination. When light enters the eye, it ultimately reaches the rods and c ...

* Epidemic threshold *

Flicker fusion threshold The flicker fusion threshold, critical flicker frequency (CFF) or flicker fusion rate, is a concept in the psychophysics of vision. It is defined as the frequency at which an intermittent light stimulus appears to be completely steady to the avera ...

* Masking threshold *

Odor detection threshold The odor detection threshold is the lowest concentration of a certain odor compound that is perceivable by the human sense of smell. The threshold of a chemical compound is determined in part by its shape, polarity, partial charges, and molecul ...

Renal threshold In physiology, the renal threshold is the concentration of a substance dissolved in the blood above which the kidneys begin to remove it into the urine. When the renal threshold of a substance is exceeded, reabsorption of the substance by the proxi ...

Seizure threshold The term seizure threshold is used to describe the balance between excitatory (glutaminergic) and inhibitory ( GABA-ergic) forces in the brain which affect how susceptible a person is to seizures. Those diagnosed with epilepsy or certain other neur ...

Sensory threshold In psychophysics, sensory threshold is the weakest stimulus that an organism can sense. Unless otherwise indicated, it is usually defined as the weakest stimulus that can be detected half the time, for example, as indicated by a point on a probabi ...

Threshold expression Mitochondrial threshold effect is a phenomenon where the number of mutated mtDNA has surpassed a certain threshold which causes the electron transport chain and ATP synthesis of a mitochondrion to fail. There isn't a set number that needs to be su ...

* Threshold limit value *

Threshold model In mathematical or statistical modeling a threshold model is any model where a threshold value, or set of threshold values, is used to distinguish ranges of values where the behaviour predicted by the model varies in some important way. A particula ...

Threshold of pain The threshold of pain or pain threshold is the point along a curve of increasing perception of a stimulus at which pain begins to be felt. It is an entirely subjective phenomenon. A distinction must be maintained between the stimulus (an external ...

Threshold potential In electrophysiology, the threshold potential is the critical level to which a membrane potential must be depolarized to initiate an action potential. In neuroscience, threshold potentials are necessary to regulate and propagate signaling in both ...

Other science-related

Ecological threshold Ecological threshold is the point at which a relatively small change or disturbance in external conditions causes a rapid change in an ecosystem. When an ecological threshold has been passed, the ecosystem may no longer be able to return to its st ...

Error threshold (evolution) In evolutionary biology and population genetics, the error threshold (or critical mutation rate) is a limit on the number of base pairs a self-replicating molecule may have before mutation will destroy the information in subsequent generations o ...

Extinction threshold Extinction threshold is a term used in conservation biology to explain the point at which a species, population or metapopulation, experiences an abrupt change in density or number because of an important parameter, such as habitat loss. It is at t ...

Lasing threshold The lasing threshold is the lowest excitation level at which a laser's output is dominated by stimulated emission rather than by spontaneous emission. Below the threshold, the laser's output power rises slowly with increasing excitation. Above t ...

Percolation threshold The percolation threshold is a mathematical concept in percolation theory that describes the formation of long-range connectivity in Randomness, random systems. Below the threshold a giant connected component (graph theory), connected component ...

Polygyny threshold model The polygyny threshold model is an explanation of polygyny, the mating of one male of a species with more than one female. The model shows how females may gain a higher level of biological fitness by mating with a male who already has a mate. The ...

Threshold cryptosystem A threshold cryptosystem, the basis for the field of threshold cryptography, is a cryptosystem that protects information by encrypting it and distributing it among a cluster of fault-tolerant computers. The message is encrypted using a public key, ...

Threshold displacement energy In materials science, the threshold displacement energy () is the minimum kinetic energy that an atom in a solid needs to be permanently displaced from its site in the lattice to a defect position. It is also known as "displacement threshold en ...

Threshold energy In particle physics, the threshold energy for production of a particle is the minimum kinetic energy that must be imparted to one of a pair of particles in order for their collision to produce a given result. If the desired result is to produce a t ...

Threshold graph In graph theory, a threshold graph is a graph that can be constructed from a one-vertex graph by repeated applications of the following two operations: # Addition of a single isolated vertex to the graph. # Addition of a single dominating vertex t ...

Threshold knowledge Threshold knowledge is a term in the study of higher education used to describe core concepts—or threshold concepts—which, once understood, transform perception of a given subject, phenomenon, or experience.Meyer J H F and Land R 2003 "Threshold ...

Threshold value Critical value may refer to: *In differential topology, a critical value of a differentiable function between differentiable manifolds is the image (value of) ƒ(''x'') in ''N'' of a critical point ''x'' in ''M''. *In statistical hypothesis ...

Threshold voltage The threshold voltage, commonly abbreviated as Vth or VGS(th), of a field-effect transistor (FET) is the minimum gate-to-source voltage (VGS) that is needed to create a conducting path between the source and drain terminals. It is an important s ...

Thresholding (image processing) In digital image processing, thresholding is the simplest method of segmenting images. From a grayscale image, thresholding can be used to create binary images. Definition The simplest thresholding methods replace each pixel in an image with a ...

Transparency threshold In data compression and psychoacoustics, transparency is the result of lossy data compression accurate enough that the compressed result is perception, perceptually indistinguishable from the uncompressed input, i.e. perceptually lossless. A tra ...

Other uses

* ''Threshold'' (video game), a 1981 video game * Thresholds, a nonprofit organization serving persons with mental illnesses and substance abuse problems in Illinois * Threshold Audio, a manufacturer of high end audio amplifiers *

Displaced threshold A displaced threshold or DTHR is a runway threshold located at a point other than the physical beginning or end of the runway. The portion of the runway behind a displaced threshold may be used for takeoff in either direction and landings from the ...

, an aviation term *

Election threshold The electoral threshold, or election threshold, is the minimum share of the primary vote that a candidate or political party requires to achieve before they become entitled to representation or additional seats in a legislature. This limit can ...

, a concept in voting systems *

Poverty thresholds (United States Census Bureau) For statistical purposes (e.g., counting the poor population), the United States Census Bureau uses a set of annual income levels, the poverty thresholds, slightly different from the federal poverty guidelines. As with the poverty guidelines, the ...

*In

government procurement Government procurement or public procurement is the procurement of goods, services and works on behalf of a public authority, such as a government agency. Amounting to 12 percent of global GDP in 2018, government procurement accounts for a subst ...

, the expenditure value which determines which rules and procedures are to be applied to a proposed purchase