| Abbreviation | Definition |
|---|---|
| SLL | Shift Left Logical |
| SLP | Set Loop Point |
| SLQ | Shift Left with MQ |
| SLW | Shift Left Word |
| SLZ | Shift Left Zero |
| SM | Shell Model |
| SM | Simple Mainloop |
| SMBI | Set Memory Bit I |
| SMC | Self-Modifying Code |
| SMI | System Management Interrupt |
| SMS | Shred Mylar Surface |
| SMSW | Store Machine Status Word |
| SNW | String Next Word |
| SNZ | Skip if Not Zero |
| SO | Stack Overflow |
| SOAL | Sequencing Operations for Assembly Lines |
| SOAP | Storage Operand Attenuation Prevention |
| SOC | Start Of Comment |
| SOL | Start Of Line |
| SOP | Stop and Order Pizza |