j
Particularly as j, sometimes the Roman numeral for 1 when occurring as a terminal symbol following the one, two, or even three i symbols, e.g. as iij for the value 3.
mathematics As used by engineers in place of the more usual i, as j, the imaginary value
, used very powerfully in applied mathematics in the form of complex number.
mechanics, electromagnetics, etc. As J, see joule; see SI alphabet for prefixes.
