| Acronym | Definition |
|---|
| Str | Street |
| Str | String (programming languages) |
| Str | Short Tandem Repeat |
| Str | Straight |
| Str | Strength |
| Str | Strip |
| Str | Straße (German: Street) |
| Str | Structures |
| Str | Smith Travel Research |
| Str | Strand |
| Str | Send to Receive |
| Str | State Teachers Retirement (various locations) |
| Str | Statutory Tax Rate |
| Str | Shadow of the Tomb Raider (gaming) |
| Str | Stadtrat (Austria, Europe) |
| Str | Scientific and Technical Reports (various organizations) |
| Str | Santa Rosa (Guatemala territorial division) |
| Str | Sell To Rent |
| Str | Suspend to RAM |
| Str | Straat (Dutch: street) |
| Str | Stand to Reason (Signal Hill, CA) |
| Str | Questar Corporation (Stock Symbol) |
| Str | Springfield Terminal Railway Company (North Billerica, MA) |
| Str | Stamford Twin Rinks (Stamford, CT) |
| Str | School Technology Resources (Scotts Valley, CA) |
| Str | Scuderia Toro Rosso (Italian auto racing team) |
| Str | Student-Teacher Ratio (education measurement) |
| Str | Self-Tuning Regulator |
| Str | Subtropical Ridge (climate) |
| Str | Scientific-Technical Revolution |
| Str | Service Treatment Record (US DoD) |
| Str | String |
| Str | Save to Ram |
| Str | Status Request |
| Str | Structure |
| Str | Self Tuned Radio |
| Str | Sales to Retailers (Beer Industry) |
| Str | Single Tablet Regimen (medical treatment) |
| Str | Student Teacher Relationship (education) |
| Str | Steps to Reproduce (a behavior) |
| Str | Support, Time and Recovery Worker (formerly Community Support Worker) |
| Str | Session-Termination Request (computer networking) |
| Str | Special Theory of Relativity |
| Str | Studienrat (Austria, Europe) |
| Str | Suspicious Transaction Report |
| Str | Soil Temperature Regime |
| Str | Sell Through Rate |
| Str | Stromelysin |
| Str | Sustained Transfer Rate |
| Str | Stuttgart, Germany - Echterdingen (Airport Code) |
| Str | State Transition Rule (language) |
| Str | Society of Thoracic Radiology |
| Str | Software Technology Roadmap |
| Str | Store Task Register |
| Str | Software Test Report |
| Str | Software Technology Review (Carnegie Mellon) |
| Str | Software Trouble Report |
| Str | Sindicato de Trabalhadores Rurais (Portuguese: Union of Rural Workers; Brazil) |
| Str | Synchronous Transmitter Receiver |
| Str | Square to Round (mechanical) |
| Str | Symbol Timing Recovery |
| Str | Subcontract Technical Representative |
| Str | Structural Requirement |
| Str | Synchronous Transmit Receive |
| Str | System Technical Report |
| Str | Service Terminal Rotterdam |
| Str | Subject to Regularization (Visa to Nigeria) |
| Str | Specialised Technology Resources (UK) Ltd. |
| Str | Submarine Thermal Reactor |
| Str | Sequential Transfer Rate |
| Str | Soft-Tissue Rheumatism (medical disorder) |
| Str | Short-Term Recall (neuropsychology) |
| Str | Spot The Reference |
| Str | Southwest Times Record (newspaper) |
| Str | Shawnee Terminal Railway Company |
| Str | Stall Torque Ratio (torque converter) |
| Str | Sold To Rent |
| Str | Science Tape Recorder |
| Str | State- and Time-Dependent Routing |
| Str | Smile, Talk, Raise both arms (method to determine if a person has suffered a stroke) |
| Str | System Test Review |
| Str | Spurious Trip Rate |
| Str | Scanning Television Radiometer |
| Str | Société Tunisienne de Radiologie |
| Str | Software Test Result |
| Str | System Trouble Report |
| Str | Selective Trunk Reservation |
| Str | Starboard Thermal Radiator |
| Str | Servant Team Retreat |
| Str | Symmetric, Transitive, and Reflexive (COM identity rule) |
| Str | Systems Technology Radar |
| Str | Swimming Technology Research, Inc. |
| Str | Specialized Tone Receiver (Sprint) |
| Str | Suspect Transaction Report |
| Str | Short-Term Random Variance |
| Str | Subject Terminal Control Release |
| Str | Student Training Requirement |
| Str | Standard Training Requirement |
| Str | Speaker Trained Recognition (speech recognition systems) |
| Str | Steel Tank Rectifier |
| Str | Supplementary Technical Requirement |
| Str | Survey Team Report |
| Str | Synchronous Track & Receive |
| Str | Storage Retrieval Truck (Automated Warehouse) |
| Str | Systems and Technology Research, Inc (Fairfax, Virginia) |
| Str | System Timing References |
| Str | Service Transaction Record |