j

The symbol for current density (sense 1).

Abbreviation for a judge or justice. Other abbreviations include a.j., Associate Judge/Justice; c.j., Chief Judge/Justice; j.a.g., Judge Advocate General; jj., Judges/Justices; j.p., Justice of the Peace; l.j., Law Judge; p.j., Presiding Judge; etc.

A prefix used to indicate an imaginary number. (Operator j)