Bipolar

Are referred to as bipolar:

• Bipolar world, an expression of the Cold War, described the division of the earth into two hemispheres
• Bipolar cells, nerve cells with two appendages, specialized for conveying certain sense
• Bipolar cells of the retina in the eye derive further information from the light-sensitive photoreceptors
• Bipolar disorder Bipolar affective disorder (also called " manic- depressive illness " ), a mental disorder
• Bipolar flagella, the arrangement of flagella in protozoans

And in electrical engineering:

• Bipolar voltage source: a DC voltage source with a positive and a negative voltage to ground
• Bipolar Signal transmission: the balanced signal transmission
• Bipolar transistor to contribute in the charge carriers of both polarities to function

• Disambiguation