| Strategic Technical Directorate | Academic & Science |
| Sigma Tau Delta | Academic & Science |
| Stop, Treat, and Destroy | Academic & Science |
| Salinity, Temperature, and Depth | Academic & Science |
| Santo Domingo | Airport Code |
| Stuart Tyrrell Developments (Company) | Business |
| Skip Tooth Design | Business |
| Software Tool and Die | Business |
| Short Term Debt | Business |
| Subscribers Trunk Dialling | Business |
| Banco Santander Cent Hispano | Business |
| Someone Truly Divine | Community |
| Selling The Drama | Community |
| Substitute Trustee's Deed | Community |
| Scriptures Temple Dating | Community |
| Simon Tissot Dupont | Community |
| Short Tiny Dancers | Community |
| Simplified Trellis Decoder | Computer and Networking |
| Set Direction Flag | Computer Assembly Language |
| Software Test Document | Computer Technology |
| Spyro The Dragon | Computing |
| Semantic Type Definition | Computing |
| Super Twist Display | Computing |
| Suspend To Disk | Computing |
| Save To Disk | Computing |
| Set Direction | Computing |
| Selection Transmit Diversity | Computing |
| Synchronous Time Division | Computing |
| Store Indirect to Data Space | Computing |
| State Transition Diagram | Computing |
| Save The Date | Computing |
| Dobra | Country Currency |
| Stadium | Cryptocurrency |
| Sexually Transmitted Diseases | Disease |
| Sexualy Transmited Disease | Disease |
| Doctor of Sacred Theology | Educational Degree |
| Sacrae Theologiae Doctor | Educational Degree |
| Locoscript Standard | File Type |
| State Transition Diagram Graphics File | File Type |
| Short Term of Duty | General |
| Star Trek Discovery | General |
| Sunbeam Talbot Darracq | General |
| Supertech Dino | General |
| Super Turbo Diesel | General |
| Snails Taste Delicious | General |
| Scheduled Time of Departure | General |
| Solar Terrestrial Dispatch | General |
| Standard Trunk Dialing | General |
| Super Tool Destruction | General |
| Small Tiny Dogs | General |
| Standard Time Departure | General |
| Split The Difference | General |
| Staroffice Template Drawing | General |
| Shut The Door | General |
| Skinnies Trannies and Drops | General |
| Sao Tomean Dobra | General |
| Seize The Day | General |
| STD Transmitting Dinosaur | General |
| Super Toddler Drool | General |
| Stop The Disease | General |
| Started Trial Dog | General |
| Short Term Disability | Governmental |
| Severe Tire Damage | Governmental |
| Shoot The Dummy | Governmental |
| Syrian Terrorist Detector | Governmental |
| State Territory District | Governmental |
| SATROD | Indian Railway Station |
| Subarashii Tomodachi Doushi (means Best Friends) | International |
| Stunde | International |
| Small Trimaran Design | International |
| Saves The Day | Jobs |
| Standard Deviation | Maths |
| Standing Tremor Disorder | Medical |
| Skeletal Transcript Database | Medical |
| sexually transmitted disease—but | Medical |
| Sexual Transmitted Diseases | Medical |
| Sexual Transmitted Disease | Medical |
| Sheep Transmitted Disease | Medical |
| Sexual Tension Disorder | Medical |
| Small Testicle Disorder | Medical |
| Short-Term Depression | Medical |
| ST-segment depression | Medical |
| Sexually Transmitted Disease | Medical |
| Skin Test Dose | Medical |
| Sterilized Testing Developer | Medical |
| Sweet Translucent Dreams | Messaging |
| Some Thing Duh | Messaging |
| Soft Touch Denial | Messaging |
| Synthetic Training Device | Military and Defence |
| Software Test Description | Military and Defence |
| Sao Tome Dobra | Regional |
| Santo Domingo, Venezuela | Regional |
| Simple To Design | Softwares |
| Security Tools Distribution | Softwares |
| Shuttle Test Director | Space Science |
| Standard | Space Science |
| Standard Transmission Difficulties | Space Science |
| Subscriber Trunk Dialling | Telecommunication |
| Subscriber Trunk Dialing | Telecommunication |
| Secondary Telecom District | Telecommunication |
