| Acronym | Meaning |
 | AUX | Auxilliary |
| PVS | Periscope View Simulators (associated With 21a Series) |
| AWSACS | All Weather Standoff Attack Control System |
| S/L | Switch/light |
| YG | Garbage Lighter (self-propelled) |
| HSD | Horizontal Situation Display |
| CHK | Check Or Checkout |
| LSSC | Light Seal Support Craft (special Warfare) |
| ME | Mechanical Engineering |
| FALT | Final Altitude |
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