IRR
IRR stands for:
- Infrared radiometer , measuring instrument on board the European Remote Sensing Satellite
- Infrared reflectography , visualization of technical drawings under paintings by recording the infrared reflection
- Internal rate of return , English for internal interest rate
- International Rhine Regulation , Swiss-Austrian Society
- Internet Routing Registry , a higher-level routing police database that uses the global RIRs as a source
- Iranian rial , currency code according to ISO 4217
- Iraqi Republic Railways Establishment , code for the ownership feature of a railroad car in the car number
- Iron Road Railways , a former American railway company, which in the Montreal, Maine and Atlantic Railway has risen
Irr stands for:
- Irregular galaxy , in astronomy
irr stands for:
