| InterStellar Medium | Academic & Science |
| International School Moshi | Academic & Science |
| International Student Ministry | Academic & Science |
| International School Manila | Academic & Science |
| Indian School of Mines | Academic & Science |
| Institute of Science and Mathematics | Academic & Science |
| Institute of Statistical Mathematics | Academic & Science |
| Incorporated Society of | Academic & Science |
| Islamic Society of Milwaukee | Academic & Science |
| Institute for Statistical Manipulation | Academic & Science |
| Independent Student Media | Academic & Science |
| Kissimmee (fl) | Airport Code |
| Incorporated Society of Musicians | Business |
| Industrial Strength Marketing | Business |
| International Systems Marketing | Business |
| Inspiration Mining Corporation | Business |
| In-transit Service Manager | Business |
| International Survey Member | Business |
| International Success Mentoring | Business |
| International Success Motivation | Business |
| Institute for Supply Management | Business Management |
| Institute of Supply Management | Business Management |
| Independent School Management | Business Management |
| Information Systems Management | Business Management |
| International School of Management | Business Management |
| Interactive Studio Management | Business Management |
| Intelligent System of Music | Community |
| International School of Milan | Community |
| International School of Minnesota | Community |
| Icetratt Sports Management | Community |
| Industrial, Scientific, Medical | Computer and Networking |
| Infrared Sensor Module | Computing |
| Intel Server Management | Computing |
| Internet Service Manager | Computing |
| Interior Shading Method | Computing |
| Incremental Search Method | Computing |
| Industrial Standard Malayalam | Computing |
| Information Security Management | Computing |
| Image Switch Menu | Computing |
| Internetwork Status Monitor | Computing |
| Image Source Method | Computing |
| Intrushield Security Manager | Computing |
| Integrated Service Management | Computing |
| Ibm Session Manager | Computing |
| i-Control Services Manager | Computing |
| Integrated Services Module | Computing |
| Industry Solution Media | Computing |
| Informix Storage Manager | Computing |
| Internet Search Metrics | Computing |
| Internet Sales Manager | Computing |
| Information Source Module | Computing |
| Intensive Site Monitoring | Computing |
| Intersite Messaging Service | Computing |
| International Service Manager | Computing |
| Integrated Safety Management | Computing |
| Inductor Super-magnetron | Electronics |
| Industrial, Scientific, & Medical Radio Frequency Band | Electronics |
| Inclination Sensor Module | General |
| Interior Scanning Module | General |
| Intelligent Servo Module | General |
| Ice Silver Metallic | General |
| Integrated System Model | General |
| Instructional Supplies and Materials | General |
| Integrated Structural Modeling | General |
| Individual Social and Material | General |
| Inter Spoke Milling | General |
| Ingenuity Sun Media | General |
| Islamic State Manufacturing | General |
| Integrated Security Manufacturing | General |
| Ice Sailor Moon | General |
| Image Support Module | General |
| Integrated Strategic Measure | General |
| Ima Special Messenger | General |
| Interactive Services Manager | General |
| I Seek Misery | General |
| Independent Study Mentorship | General |
| Intelligent Shift Module | General |
| Independant Study Mentorship | General |
| Irish School of Motoring | General |
| Its So Meaningless | General |
| Intelligent Speed Management | General |
| Ideal Saddle Modification | General |
| Integral Sliding Mode | General |
| Southeast Michigan | General |
| Internationale Süßwaren Messe | General |
| Internal Sinus Manipulation | General |
| Incito Scientia Meditatus | General |
| Image System Multicolor | General |
| Information Security Manual | General |
| Insecure Selfish Me | General |
| International Student Movement | General |
| Industrial Security Manual | Governmental |
| International Solidarity Movement | Governmental |
| Institute of Statistical Math | Governmental |
| Institute of Sales Management | Governmental |
| ISMAILA HARYANA | Indian Railway Station |
| Instituto Social de la Marina | International |
| Internacional Socialista de Mujeres | International |
| Internet and Social Media | Internet |
| Interior Systems Mechanic | Jobs |
| Industry, Science, Medicine radio frequency band | Medical |
| Industrial Scientific and Medical | Medical |
| Imperial Service Medal | Military and Defence |
| Installation Support Module | Military and Defence |
| Integrated Sustainment Maintenance | Military and Defence |
| International Safety Management | Military and Defence |
| Industrial, Scientific, and Medical Radio Band | Radio Science |
| Integration Server Management | Softwares |
| Interactive Surface Modeling | Softwares |
| International Sports Multimedia | Sports |
| Issuer Set Margin | Stock Exchange |
| Instrumentation, Scientific, and Medical | Telecommunication |
