| Abbreviation | Definition |
|---|---|
| HFC | Hybrid Fiber Coax |
| HFC | Hyper Fiber Chip |
| HFCT | High-Frequency Current Transformer |
| HFE | High Frequency Electronics |
| Hfe | Transistor Gain |
| HFET | Heterojunction Field Effect Transistor |
| HFF | High Frequency Filter |
| HFH | Honed in Hertz, (Mg)=(Backwards F) new letter after Z magnifying a relating tone - 2 pointing finger |
| HFI | HyperFine Interaction |
| HFL | High Frequency Laser |
| HFM | Heavy Frequency Modulation |
| HFR | Height Frame Rate |
| HFRR | HydroFluoric acid Reprocessor Return system |
| HFS | HyperFine Shift |
| HFSWR | High Frequency Surface Wave Radar |
| HG | Hardware Gain |
| HGE | Heavy Gold Electroplate |
| HGF | Horizontal Gradient Freeze |
| HGL | Hewlett-Packard Graphics Language image format |
| HGS | High Gain Servo |