J (disambiguation)

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J is the tenth letter of the Latin alphabet.

J may also refer to:



Genetics and medicine[edit]


  • J, symbol used to denote the Bessel function
  • j, used as the symbol for the imaginary unit () in fields where i is used for a different purpose (such as electrical current)
  • j and j2 (or ) are also used for the complex cube roots of unity
  • j, a number with the property j 2 = +1, used in the definition of the split-complex numbers
  • j, the second imaginary unit of a quaternion
  • j, an index variable in a matrix
  • The j-invariant, a modular function




Film and television[edit]

Other uses[edit]

See also[edit]