Ilmenau, Thuringia, Germany (former vehicle plate code; newer plates use IK for Ilm-Kreis)
Science and technologyedit
Interlingua de Peano, a controlled language of Neo Latin used as an auxiliary language - not to be confused with Interlingua de IALA (IA), a constructed language
Biology, chemistry, and medicineedit
Interleukin, a family of cytokines, in biochemistry