Intenational Units - Wikipedia
Intenational Units is usually abbreviated as
IU in English, and
UI in Romance languages (for example Spanish unidad internacional, French unité internationale, Italian unità internazionale, Romanian unitate internațională),
IE in several Germanic languages (for example German internationale Einheit, Dutch internationale eenheid) or as other forms (for example
Russian МЕ, международная единица mezhdunarodnaya yedinitsa,
Hungarian NE, nemzetközi egység).