| Abbreviation | Definition |
|---|---|
| FLIX | Flexible Length Instruction Extension |
| FLM | Fixed Length Mask |
| FM | Fill Mode |
| FMA | Fused Multiply and Add |
| FMB | Floating Modulo Base |
| FOPC | False Out-of-Paper Condition |
| FOT | Follow On Transfer |
| FP | Floating Point |
| FP | Font Position |
| FPA | Focal Plane Assembly |
| FPC | Four Packed Code |
| FPE | Floating Point Exception |
| FPP | Floating Point Pair |
| FRRA | Fire Resistance Rated Assembly |
| FSM | Fixed String Mode |
| FSM | Fold, Spindle, and Mutilate |
| FUN | Function Unknown Now |
| FW | Field Width |
| FW | Function Word |
| GAAB | General Assembly Affairs Branch |