| Abbreviation | Definition |
|---|---|
| SHRD | Double Precision Shift Right |
| SI | Signed Integer |
| SI | Source Index |
| SIC | Symbolic Instruction Code |
| SIDT | Store Interrupt Descriptor Table |
| SIE | Start Interpreted Execution |
| SIM | Set Interrupt Mask |
| SIS | Simple Instruction Set |
| SKP | Skip |
| SL | Save Layout |
| SL | Short Length |
| SL | Source Language |
| SL | Speak Language |
| SL | Statement List |
| SLA | Shift Left Arithmetic |
| SLC | Set Location Counter |
| SLD | Source Level Definition |
| SLDT | Store Local Descriptor Table |
| SLI | Set Link Information |
| SLI | Suppress Length Indication |