| Acronym | Definition |
|---|
| IRJ➣International Railway Journal (UK) |
| IRJ➣Insulated Rail Joint |
| IRJ➣Infrared Jammer |
| IRJ➣iView Runtime for Java (SAP technology) |
| IRJ➣Isolated Rabbit Jejunum |
| IRJ➣Isnin Rabu Jumaat (Malay: Monday Wednesday Friday) |
| IRJ➣Interim Radar Jammer |