| Meaning | Category |
| Sale In Progress | Business->General |
| Sales Inventory Purchase | Business->Accounting |
| School Improvement Plan | Community->Educational |
| School Improvement Program | Governmental->State & Local |
| Schools Integration Project | Community->Educational |
| Scilab Image Processing | Computing->General |
| Seasonal Irrigation Program | Miscellaneous->Farming |
| Self Initiated Program | Computing->Software |
| Semiconductor Intellectual Property | Community->Law |
| Semper In Primis | International->Latin |
| Service Interface Point | Computing->Telecom |
| Session Initialization Protocol | Computing->Networking |
| Session Initiation Protocol | Computing->Telecom |
| Shooting Is Pointless | Community->Law |
| Side Impact Protection | Governmental->Transportation |
| Simferopol, Ukraine | Regional->Airport Codes |
| Simulations In Physics | Academic & Science->Physics |
| Single Inline Package | Academic & Science->Electronics |
| Smds Interface Protocol | Computing->Networking |
| Social Interactive Playtime | Community->Educational |
| Soft Input Panel | Governmental->NASA |
| Software Input Panel | Computing->General |
| Special Interest Program | Governmental->US Government |
| Spring Intensive Program | Academic & Science->Universities |
| Standard Investment Planning | Business->Stock Exchange |
| Standards In Practice | Governmental->US Government |
| State Implementation Plan | Governmental |
| Stay In Play | Community->Sports |
| Structurally Insulated Panels | Governmental->NASA |
| Student Information Portal | Academic & Science->Universities |
| Student Initiated Project | Academic & Science->Universities |
| Submission Information Package | Business->General |
| Support Incident Pack | Governmental->Military |
| System Enhancement Program | Governmental->Military |
| System Implementation Plan | Governmental->Military Governmental->NASA |
| System Improvement Program | Governmental->Military |
| System Interface Procedure | Computing->Networking |
| Systematic Investment Plan | Governmental->State & Local |
| The Subaru Information Pages | Governmental->Transportation |
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