| Student Press Initiative | Academic & Science |
| Soy Protein Isolate | Academic & Science |
| Self-Paced Instruction | Academic & Science |
| Stanford Pascal Imaging | Academic & Science |
| Store Payment Interface | Accounts and Finance |
| Springfield (il) | Airport Code |
| Spitfire Resources Ltd | Business |
| Scottish Power, PLC | Business |
| Sales Per Item | Business |
| Selected Period Investment | Business |
| Staal Private Investigation | Business |
| Simulations Publications, Inc. | Business |
| Silverstein Properties, Inc. | Business |
| Singapore Paranormal Investigators | Business |
| Structure Probe, Inc. | Business |
| Special Projects International | Business |
| Solar Power Inc | Business |
| Security Personnel Inc | Business |
| Schaumburg Polk Inc | Business |
| Swiss Performance Index | Business |
| Single Process Initiative | Business |
| Skim Pembiayaan Ikhtiar loan scheme | Business |
| Strategy Productivity Insight | Business |
| Summary of Proposed Investment | Business |
| Slagging Pyrolysis Incinerator | Chemistry |
| Samaritan's Purse International | Community |
| Software in the Public Interest | Community |
| spots per inch | Computer and Networking |
| Standard Programmatic Interface | Computer and Networking |
| Synchronous Parallel Interface | Computer Hardware |
| Scsi (small Computer System Interface) Parallel Interface | Computer Hardware |
| SaaS PaaS and IaaS | Computing |
| Service Programming Interface | Computing |
| Synchronous Peripheral Interface | Computing |
| Software Process and Infrastructure | Computing |
| Sub Port Identifier | Computing |
| Smart Plug-In | Computing |
| Saas Paas Iaas | Computing |
| System Peripheral Interface | Computing |
| Software Pirates Inc. | Computing |
| Synchronization Programming Interface | Computing |
| Serial Peripheral Interconnect | Computing |
| Sensitive Personal Information | Computing |
| SCSI-3 (Small Computer System Interface) Parallel Interface | Computing |
| Security Parameters Index | Computing |
| Suse Plug-In | Computing |
| Scsi Parallel Interface | Computing |
| System Parameters Information | Computing |
| Software Process Impediment | Computing |
| Safeguarding Proprietary Information | Computing |
| Single Point Imaging | Computing |
| Single Point Interchange | Computing |
| Security Policy Index | Computing |
| Shopping | Cryptocurrency |
| Solder Paste Inspection | Electronics |
| Split Port Induction | Electronics |
| Single Point Injection | General |
| Senior Photographers International | General |
| Split Port Injection | General |
| Safety Performance Indicator | General |
| Society of the Plastics Industry | General |
| Smartphone Integration | General |
| Suzuki Philippines Inc. | General |
| Service Performance Insight | General |
| Sierra Pacific Industries | General |
| Swiss Precision Instruments | General |
| Sales Performance International | General |
| Specialty Products Insulation | General |
| Smart Passive Income | General |
| State Personal Income | General |
| Solar Power International | General |
| Scholastic Phonics Inventory | General |
| Smart Plant Instrumentation | General |
| Smart Policing Initiative | General |
| Synthetic Personality Inventory | General |
| Social Progress Imperative | General |
| Standardized Precipitation Index | General |
| Strategies for Policing Innovation | General |
| Sonography Principles and Instrumentation | General |
| Serial Parallel Interface | General |
| Sustainable Preservation Initiative | General |
| Sow Productivity Index | General |
| Sectoral Performance Indicators | General |
| Self Publishing Insight | General |
| Sector Partnerships Initiative | General |
| Stitch Per Inch | General |
| Service Performance Improvement | General |
| SPecial Investigative | Governmental |
| Strategy Planning and Implementation | Governmental |
| Special Private Intelligence | Governmental |
| Special Public Interest | Governmental |
| Stored Product Insects | Governmental |
| Social Progress Index | Governmental |
| Summer Peacebuilding Institute | Governmental |
| Southern Police Institute | Governmental |
| Serial Peripheral Interface | Information Technology |
| Stateful Packet Inspection | Information Technology |
| Societ Psicoanalitica Italiana | International |
| Societe de Proteines Industielles | International |
| Springfield Illinois Airport. Springfield, Illinois. USA Abraham Lincoln Capital Airport. | International |
| Superintendent of Public Instruction | Jobs |
| S Polynomial Information | Maths |
| Semantics, Proof, and Implementation | Maths |
| Samples Per Inch | Measurement Unit |
| Scottsdale Prevention Institute | Medical |
| Strategic Planning Initiative | Military and Defence |
| Standard Performance Indicator | Military and Defence |
| Special Packaging Instruction | Military and Defence |
| Special Inspection | Military and Defence |
| Schedule Performance Index | Military and Defence |
| Software Process Improvement | Military and Defence |
| Special Investigative (usaf) | Military and Defence |
| Sensor Point of Interest | Military and Defence |
| Subsequent Protocol Identifier | Networking |
| Scsi-3 Parallel Interface | Networking |
| Security Parameter Index | Networking |
| Statefull Packet Inspection | Networking |
| Session Parameter Index | Networking |
| Capital Airport, Springfield, Illinois USA | Regional |
| South Padre Island, Texas | Regional |
| Software Patent Institute | Softwares |
| Standard Practice Instruction | Space Science |
| Surface Position Indicator | Space Science |
| Soccer Power Index | Sports |
| Service Provider Interface | Telecommunication |
