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IR、Ir、ir 或 iR 是一个二合字母，可以指：
IR 可以是下列意思：
註冊工程師的前綴名銜（Ingenieur的缩写）
伊朗的两位字母国家代码
資訊檢索
国际关系
紅外線或化學中的紅外線光譜...