IR

[1] Internet Registry

[2] Infra Red - Infrarot

[3] Index/Instruction Register

[4] Iterative Refinement - schrittweise Verfeinerung (von Problemen)

[5] Information Retrieval

[6] Instrument Reading

[7] Insulation Resistance

[8] Interrogator-Responder (->"IEEE Standard Dictionary")

[9] Internetwork Router

[10] ISO3166 2LA ( = Ländercode bzw. TopLevelDomain) für Iran