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- Irazú Volcano
- IRB/Independent Ethics Committee
- IRC
- IR color photography
- IRCS
- IRC source
- IRC红外源
- IrDA
- IrDA infrared connection technology
- IrDA port
- IrDA红外连接技术
- Irdin Manha fauna
- Irdinmanhan Stage
- irdome
- IR drop
- IRE
- I-regular group
- Ireland
- Irenaeus
- Irene
- Irene Joliot-Curie
- Irene Papas
- IRF
- IRFA
- IR fluorescent photography