| Abbreviation | Definition |
|---|---|
| SDTI | San Diego Trolley Inc. |
| SDTI | Security Dynamics Technologies Inc |
| SDTI | Software Development Tools Inc |
| SDW | Shows, Dearman, & Waits |
| SDW | SiteDesignWorks |
| SDY | Spectrum Dyed Yarns, Inc. |
| SDZ | Shopping Directory Zone |
| SE | Salland Engineering |
| SE | Science Everywhere |
| SE | Societas Europaea |
| SE | Sony Ericsson |
| SE | Spicy Entertainment |
| SE | Stahnke Electronics |
| SE | Stark Enterprises |
| SEA | Stasis Enterprises Alliance |
| SEA | Superior Engineering Associates |
| SEAI | Science and Engineering Alliance, Inc. |
| SEAI | Superior Engineering Associates, Inc. |
| SEAP | Software Exporters Association of Pune |
| SEAQ | Software Engineering Australia Queensland |