sort by Rank | Alpha
| Possible Meanings | Rank |
| Source Internal Revenue Service | **** |
| supplemental inflatable restraint system | *** |
| Sufi Islamia Ruhaniat Society | *** |
| Social Issues Research Series | *** |
| Social Investment Research Service | *** |
| Student Instructional Rating System | *** |
| Student Information Repository System | *** |
| Security Incident Reporting System | *** |
| Safety Information Reporting Service | *** |
| Spanish Insulin Resistance Study | *** |
| Symposium on Intelligent Robotics Systems | *** |
| sepsis/Systemic Inflammatory Response Syndrome | ** |
| severe inflammatory response syndrome | ** |
| Skill Index Ranking Scale | ** |
| Sleep Impairment Rating Scales | ** |
| susceptible-infected-recovered-susceptible | ** |
| systemic infection response syndrome | ** |
| systemic inflammatory reaction syndrome | ** |
| systemic inflammatory response syndromes | ** |
| Systemic Inflammatory Response System | ** |
| Southern Indiana Resource Solutions | ** |
| Student Information Records System | ** |
| Symposium on Intelligent Robotic Systems | ** |
| Standard Immunisation Recall System | ** |
| Solomon Islands Radio Society | ** |
| Schizophrenia International Research Society | ** |
| age-standardized incidence ratios | ** |
| sex-standardized incidence ratios | ** |
| Social Issues Research Service | ** |
| Student Information and Registration System | ** |
| Symp on Intelligent Robotic Systems | ** |
| Sentral Illinois Radio Society | ** |
| Systematic Inflammatory Response Syndrome | ** |
| Santé Inégalités Ruptures Sociales | ** |
| Singapore Institute of Retail Studies | ** |
| self-inflating resuscitation devices | ** |
| since incidence rate ratios | ** |
| standardised incidence rate ratios | ** |
| Self Inking Rubber Stamp | ** |
| Systemisches Inflammatorisches Response Syndrom | ** |
| School Information and Research Service | ** |
| Systemic Inflammation Response Syndrome | ** |
| Surgical Instrument Repair Services | ** |
| Symposium on Intelligent Robots and Systems | ** |
| System Inflammatory Response Syndrome | ** |
| Stennis Image Retrieval System | ** |
| Strategic Insurance Risk Solutions | ** |
| Scottish Immunisation Recall System | ** |
| Seriousness of Illness Rating Scale | ** |
| Social Issues Resource Service | ** |
| Strict Interval Routing Scheme | ** |
| Student Information Record System | ** |
| Seniors Information and Referral Service | ** |
| Sudan Independent Radio Service | ** |
| Senior Information Referral Service | ** |
| Student Information Reporting System | * |
| Symposium on Robotics Systems | * |
| SATCOM Interference Response System | * |
| Shock Impact Reduction System | * |
| Siberia Integrated Regional Study | * |
| Stores Inventory Request System | * |
| Student Instructional Rating Survey | * |
| Sunraysia Information and Referral Service | * |
| Symposium on Intelligent Robot Systems | * |
| Satellite Infrared Radiation Spectrometer | * |
| School Information Research Service | * |
| Ship Inspection Reporting System | * |
| Significant Incident Reporting System | * |
| Social Issue Resource Series | * |
| System for Information Retrieval and Storage | * |
| Social Inclusion and Recovery Service | * |
| Statewide Interdepartmental Radio System | * |
| Statewide Interdisciplinary Review Service | * |
| Structural Informatics Research Seminar | * |
| Safety Information and Reporting Service | * |
| Solar and Infrared Radiation Station | * |
| Southern Insurance Restoration Services | * |
| Surveys Investigations and Research | * |
| systematic interpolative radial search | * |
| Security Information Reference System | * |
| Storage and Information Retrieval System | * |
| Sanjay Internet Resources Site | * |
| Shelbyville Industrial Rail Spur | * |
| Spatial Information Related Site | * |
| StampIt Rubber Stamps for | * |