| Abbreviation | Definition |
|---|---|
| HRAP | High Resolution Accelerometer Package |
| HRB | Human Resources Board |
| HRC | Heart Rate Control |
| HRC | Human Relations Council |
| HRC | Hasselblad Reflex Camera |
| HRD | Human Resource Development |
| HRD | High Rate Dosimeter |
| HRD | Hatch Restraint Device |
| HRDA | High Rate Data Assembly |
| HRDI | High Resolution Doppler Imager |
| HRDM | High Rate Demultiplexer |
| HRDR | High Rate Digital Recorder |
| HRDS | High Rate Data Station |
| HRE | Hepatic Reticuloendothelial [cell] |
| HREC | Human Research Ethics Committee |
| HRF | Human Research Facility |
| HRF | Heart Rate Fluctuations |
| HRFM | High Rate Frame Multiplexer |
| HRI | High Resolution Imager |
| HRIR | High Resolution Infrared Radiometer |
| HRL | Horizontal Reference Line |
| HRM | Heart Rate Monitor |
| HRM | Human Resource Manager |
| HRM | High Ratio Multiplier |
| HRM | High Rate Multiplexer |
| HRMS | High Resolution Microwave Survey |
| HROS | High Resolution Objective Spectrometer |
| HRP | Health Related Professions |
| HRPC | High Range Pressure Control |
| HRPR | Hang up and Ruin Printer Ribbon |
| HRPS | Hazard Reduction Precedence Sequence |
| HRPT | High Resolution Picture Transmission |
| HRR | Heart Rate Reserve |
| HRRI | Heart Rate Retardation Index |
| HRRR | Heart regular rate and rhythm |
| HRSC | High Resolution Stereo Camera |
| HRSI | High Temperature Reusable Surface Insulation |
| HRSI | High-temperature Reusable Surface Insulation |
| HRSR | High-Resolution Scanning Radiometer |
| HRT | Hormone Replacement Therapy |
| HRT | Humor Replacement Therapy |
| HRT | High Resolution Tracker |
| HRTS | High Resolution Telescope Spectrograph |
| HRV | Heart Rate Variability |
| HS | Hispanic Studies |
| HS | Hassium |
| HS | Bedtime (hour Of Sleep) |
| HS | Heart Sounds |
| HS | Hora Somni - Hours Of Sleep, At Bedtime |
| HS | Heart Stimulant |