| Is Only Science | Academic & Science |
| Institute Of Sociology | Academic & Science |
| Ilheus | Airport Code |
| Inspection Operation System | Banking |
| Indian Orthodontic Society | Business |
| Institute of Ocean Sciences | Business |
| Information Organization System | Business |
| Ikea Of Sweden | Business |
| Investors Overseas Services | Business |
| International Outsourcing Services | Business |
| Inspection Operation Sheet | Business |
| Irish OverSeas | Community |
| Individual Ordinance Summary | Community |
| Inter-Operability Specifications | Computer and Networking |
| Intellegent Operating System | Computer Technology |
| iPhone/iPad Operating System | Computing |
| Informational Operating System | Computing |
| Infancy Operating System | Computing |
| Internetworking Operating System | Computing |
| Interconnected Operating System | Computing |
| Input Output System | Computing |
| Input Output Supervisor | Computing |
| Input Output Subsystem | Computing |
| Intel Online Services | Computing |
| Intermediate Open System | Computing |
| Internet Of Systems | Computing |
| Internet Of Space | Computing |
| Internet Of Shopping | Computing |
| iProducts Operating System | Computing |
| iPhone Operating Sytem | Computing |
| Incompatible Operating System | General |
| Instructor Operating System | General |
| interactive Open SUSE | General |
| Is The Operating System | General |
| iDevice Operating System | General |
| Identified Orbiting Satellite | General |
| iPhone Operating Sysstem | General |
| Input Output Stable | General |
| Is a Operating System | General |
| Iphone Operation System | General |
| Isuzu Outlet Standardization | General |
| The International Organization For Standards | General |
| Integrative Organismal Systems | General |
| i Operating System | General |
| Inferior Operating System | General |
| Indian OverSeas | Governmental |
| Institute of Oceanographic Sciences | Governmental |
| Institute Of Science | Governmental |
| Internal Overflow System | Governmental |
| Independent On Sunday | Governmental |
| Interweb Opinion Stool | Internet |
| Inside Our Souls | Internet |
| It's Our Secret | Internet |
| Internet of Services | Internet |
| Intelligent Operating System | Internet |
| Information Overload Syndrome | Medical |
| Internetwork Operating System | Networking |
| Internetworking Operating System (cisco) | Networking |
| Internet Operating System | Networking |
| Ilheus, Buenos Aires, Brazil | Regional |
| iPhone/iPad/iPod Operating System | Software |
| Internal Operating System | Softwares |
| Intelligent Operating Software | Softwares |
| Iphone Operating System | Softwares |
| Indian Ocean Station | Space Science |
| Indian Ocean Ship, Spaceflight Tracking Data Network Station | Space Science |
| Input/output Supervision | Space Science |
| Instructor Operator Station | Space Science |
| International Online Soccer | Sports |
| Institute Of Swimming | Sports |
| Investment Opportunity Set | Stock Exchange |
| Internet Over Satellite | Telecommunication |
| Ilheus/Bahia-Jorge Amado Airport | Transport & Travel |
