| Abbreviation | Definition |
|---|---|
| SP | STOL Plane |
| SPAD | Signals Passed At Danger |
| SPAD | Simple Plastic Airplane Design |
| SPART | South Pole Area Rapid Transit |
| SPAS | Safety Performance Analysis System |
| SPE | Southern Pipeline Extension |
| SPEARS | Screener Proficiency Evaluation and Report System |
| SPEARS | Spill Planning Exercise and Response System |
| SPEV | Solar Power and Electric Vehicle |
| SPIF | Safe, Productive, Infrastructure Friendly |
| SPINDLE | the part of an axle on which a vehicle wheel turns |
| SPLC | Standard Point Location Code |
| SPM | Single Point Mooring |
| SPMT | Self Propelled Modular Trailer |
| SPN | Shipment Performance Notice |
| SPNSN | Suspension |
| SPOC | Saturn Performance Owners Club |
| SPOD | Signature Proof Of Delivery |
| SPOE | Sea Port of Export |
| SPR | Strategic Petroleum Reserve |