| Abbreviation | Definition |
|---|---|
| SI | Special Investigator |
| SID | Seniority Integration Date |
| SID | Sports Information Director |
| SIL | Sister In Law |
| SIO | Serious Inquiries Only |
| SIRM | Specialist of the Institute of Risk Management |
| SIS | Sister |
| SJ | Search Jockey |
| SJ | Soft Job |
| SJ | Spam Janitor |
| SJB | Senior Job Bank |
| SJI | Seattle Jobs Initiative |
| SJN | Southern Job Network |
| SK | Shadow Knight |
| SK | Specialized Knowledge |
| SK | Store Keeper |
| SKC | Chief Storekeeper |
| SL | Service Learning |
| SL | Skill Less |
| SL | Software Laborer |