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{{wiktionary|iir}} '''IIR''' may refer to: * [[Institute of International Relations (disambiguation)]] * [[Institute for International Research]], a human capital development company acquired by Informa * [[International Institute of Refrigeration]] * [[Imaging infrared]], in munitions guidance systems * [[Indo-Iranian languages]] * [[Infinite impulse response]] * [[Butyl rubber|Isobutylene isoprene rubber]] (butyl rubber) {{disambiguation}}
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