Bipolar may refer to:

Astronomy

* Bipolar nebula, 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 * Bipolar theorem, 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, previously known as manic depression, is a mental disorder characterized by periods of depression and periods of abnormally elevated mood that last from days to weeks each. If the elevated mood is severe or associated with ...

, 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 type of neuron which has two extensions

Music

* ''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 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

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 ...

, a locomotive using a bipolar electric motor * Bipolar signal, a signal that may assume either of two polarities, neither of which is zero

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, uses only one kind of charge carrier. A bipola ...

(BJT) * Heterojunction bipolar transistor (HBT) *

Insulated-gate bipolar transistor An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch, which, as it was developed, came to combine high efficiency and fast switching. It consists of four alternating la ...

(IGBT)

Other uses

* Bipolarity, polarity in international relations involving two states