Threshold may refer to:

Architecture

Threshold (door) 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 dictionarie ...

, 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 * ''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, incl ...

* ''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, a conservative imprint

Media

* ''Threshold'' (1981 film) * ''Threshold'', a 2008 film directed by Deepak Rauniyar * ''Threshold'' (TV series), an American science fiction drama series produced during 2005-2006 * "Threshold" (''Stargate SG-1''), an episode of the TV series * "Threshold" (''Star Trek: Voyager''), an episode of the TV series * Threshold Entertainment, 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), a UK progressive metal band * Threshold House, 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 ''Book of Dreams'' is the tenth studio album by Steve Miller Band. The album was released in May 1977 on Capitol Records in the United States, Canada and Japan and by Mercury Records in Europe. Three singles were released from the album in 1977 w ...

'', 1977 * "Threshold", by Turnover from '' Peripheral Vision'', 2015 * "Threshold," from the '' Scott Pilgrim vs. the World soundtrack'', 2010 * "The Threshold", by Connie Smith from '' Connie Smith'', 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, or ...

* Absolute threshold * Absolute threshold of hearing *

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 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 exercisin ...

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 * Masking threshold * Odor detection threshold *

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 * Threshold potential

Other science-related

* Ecological threshold *

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 *

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 * Polygyny threshold model *

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 * Threshold energy *

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 * Threshold voltage *

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

Other uses

* ''Threshold'' (video game), a 1981 video game *

Threshold Audio Threshold Audio is a high-end audio equipment manufacturer originally established in California in 1974 by audio engineer Nelson Pass and graphic designer René Besne. The company, today based in Houston Texas, manufactures mono-block and stereo po ...

, 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, 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 ...