Ilmenau, Thuringia, Germany (former vehicle plate code; newer plates use IK for Ilm-Kreis)
Science and technology
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 medicine
Interleukin, a family of cytokines, in biochemistry
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