Bipolar may refer to:

Astronomy

Bipolar nebula A bipolar nebula is a type of nebula characterized by two lobes either side of a central star. About 10–20% of planetary nebulae are bipolar. Formation Though the exact causes of this nebular structure are not known, it is often thought to im ...

, a distinctive nebular formation * Bipolar outflow, two continuous flows of gas from the poles of a star

Mathematics

* Bipolar coordinates, a two-dimensional orthogonal coordinate system * Bipolar set, a derivative of a

polar set In functional and convex analysis, and related disciplines of mathematics, the polar set A^ is a special convex set associated to any subset A of a vector space X, lying in the dual space X^. The bipolar of a subset is the polar of A^\circ, but ...

Bipolar theorem In mathematics, the bipolar theorem is a theorem in functional analysis that characterizes the bipolar (that is, the polar of the polar) of a set. In convex analysis, the bipolar theorem refers to a necessary and sufficient conditions for a cone ...

, a theorem in convex analysis which provides necessary and sufficient conditions for a cone to be equal to its bipolar

Medicine

Bipolar disorder Bipolar disorder (BD), previously known as manic depression, is a mental disorder characterized by periods of Depression (mood), depression and periods of abnormally elevated Mood (psychology), mood that each last from days to weeks, and in ...

, a mental disorder that causes periods of depression and periods of elevated mood ** Bipolar I disorder, a bipolar spectrum disorder characterized by the occurrence of at least one manic or mixed episode ** Bipolar II disorder, a bipolar spectrum disorder characterized by at least one episode of hypomania and at least one episode of major depression ** Bipolar disorder not otherwise specified, a diagnosis for bipolar disorder when it does not fall within the other established sub-types *

Bipolar neuron A bipolar neuron, or bipolar cell, is a type of neuron characterized by having both an axon and a dendrite extending from the soma (cell body) in opposite directions. These neurons are predominantly found in the retina and olfactory system. The em ...

, a type of neuron which has two extensions

Music

Albums

* ''Bipolar'' (Up Dharma Down album), 2008 * ''Bi-Polar'' (Vanilla Ice album), 2001 * ''Bipolar'', a 2009 album by rock group El Cuarteto de Nos * ''Bipolar'', a 2019 EP by American singer-songwriter Yot Club

Songs

* "Bipolar" (Peso Pluma song), 2023 *"Bipolar", a song by Blonde Redhead from their 1997 album '' Fake Can Be Just as Good'' * "Bipolar", a song by Gloria Trevi from her 2013 album ''De Película'' * "Bipolar", a song by Gucci Mane from his 2018 album '' Evil Genius'' *"Bipolar", a 2019 song by Kiiara *"Bi Polar", a 2021 song by Bhad Bhabie *"Bye Bipolar", a song by

Brandy Brandy is a liquor produced by distilling wine. Brandy generally contains 35–60% alcohol by volume (70–120 US proof) and is typically consumed as an after-dinner digestif. Some brandies are aged in wooden casks. Others are coloured ...

from '' B7'', 2020

Technology

* Bipolar electricity transmission, using a pair of conductors in opposite polarity * Bipolar encoding, a type of line code where two nonzero values are used ** Bipolar violation, a violation of the bipolar encoding rules * Bipolar electric motor, an electric motor with only two poles to its stationary field **

Bipolar (locomotive) The Milwaukee Road's class EP-2 comprised five electric locomotives built by General Electric in 1919. They were often known as Bipolars, which referred to the bipolar electric motors they used. Among the most distinctive and powerful electric lo ...

, a locomotive using a bipolar electric motor * Bipolar signal, a signal that may assume either of two polarities, neither of which is zero * Lithic reduction: Bipolar percussion (archaeology)

Transistors

Bipolar junction transistor A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier. A ...

(BJT) * Heterojunction bipolar transistor (HBT) * Insulated-gate bipolar transistor (IGBT)

Other uses

* Bipolarisation or Bipolarity, polarity in international relations involving two states