j, used as the symbol for the imaginary unit (Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/en.wikipedia.org/v1/":): {\displaystyle \sqrt{-1}}
) in fields where i is used for a different purpose (such as electric current)
j and j2 (orFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/en.wikipedia.org/v1/":): {\displaystyle \bar{j}}
) are also used for the complex cube roots of unity
j, a number with the property j2 = +1, used in the definition of the split-complex numbers
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