| Acronym | Meaning |
 | SIP | Session Initiation Protocol - State Implementation Plan - System Improvement Program - Systematic Investment Plan |
| SAR | Saudi Riyal (ISO 4217 Currency Code) -Search And Rescue - Special Administrative Region - Synthetic Aperture Radar |
| DOS | Denial Of Service (DoS |
| FIN | Finland (ISO 3166 Trigram) |
| CSI | See Entry |
| ZW | Zeptowatt |
| SPA | Spanish Language (ISO 639-2 Code) |
| TIMS | Tactical Internet Management System - The Institute Of Management Sciences - The International Molinological Society - Thermal Infrared Multispectral Scanner - Thermal Ionization Mass Spectrometry - Travel Information Management Services - Tuberculosis In |
| RX | Medical Prescription (possibly From Latin Recipere |
| KKK | Ku Klux Klan |
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