| Acronym | Definition | 
|---|
| IIOS➣International Institute for Okinawan Studies (University of the Ryukyus; Japan) | 
| IIOS➣Investing in Our Schools (government iniative; Australia) | 
| IIOS➣Imaging of Intrinsic Optical Signals (neurosurgery) | 
| IIOS➣Integrated Information Operation Strategy |