An alternate symbol for the "international unit" (IU). In many languages, the two words of the phrase "international unit" are reversed. In French, for example, the phrase is "unit" international
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}