HF
Abbreviation with 4 meanings
| Stands for | Heart failure |
|---|---|
| Meanings | 4 |
| Categories | Medical, Science & Engineering, Texting & Internet Slang |
| Also written | Hf |
HF has four meanings. The most common are Heart failure (cardiology) and High frequency (physics); it can also stand for Have fun and Hafnium.
Meanings of HF at a glance
| # | HF stands for | Context |
|---|---|---|
| 1 | Heart failure | Medical › Cardiology |
| 2 | High frequency | Science & Engineering › Physics |
| 3 | Have fun | Texting & Internet Slang › Gaming Slang |
| 4 | Hafnium | Science & Engineering › Chemical Element |
1. Heart failure
Medical · Cardiology Abbreviations
Clinical syndrome of breathlessness, fatigue and fluid retention caused by a structural or functional heart abnormality and confirmed by elevated natriuretic peptides or objective evidence of congestion. Guidelines classify it by left ventricular ejection fraction, which determines which medicines have proven benefit.
Example: HF clinic follow-up: euvolemic on current diuretic, uptitrating sacubitril-valsartan as blood pressure allows.
The 2021 Universal Definition of Heart Failure, endorsed by the American, European and Japanese heart failure societies, set the categories HFrEF (EF 40% or less), HFmrEF (41 to 49%), HFpEF (50% or more) and HFimpEF. "HF" has replaced "CHF" in guideline language. In other settings HF can mean high frequency or hydrofluoric acid, so spell it out in mixed documents.
2. High frequency
Science & Engineering · Physics Abbreviations
Radio band from 3 to 30 megahertz, also called shortwave. HF signals bounce off the ionosphere and can travel thousands of kilometers, so the band carries international broadcasting, amateur radio, maritime and aviation communication over oceans, and military links.
Example: Transatlantic flights switch to HF radio when they leave VHF range over the ocean.
Propagation depends on time of day and the 11-year solar cycle, since the ionosphere changes with solar activity. Many airlines now use satellite data links but keep HF as a backup. In chemistry HF means hydrogen fluoride, a highly dangerous acid.
3. Have fun
Texting & Internet Slang · Gaming Slang Abbreviations
Friendly wish typed before a match or session, usually paired with GL as GLHF. Also used when a friend leaves to do something enjoyable.
Example: Heading to the arcade with my brother, hf tonight!
Short and positive. Standalone "hf" is less common than GLHF. In chemistry HF is hydrofluoric acid and in radio high frequency, contexts the chat setting rules out.
4. Hafnium (Hf)
Science & Engineering · Chemical Element Abbreviations
Chemically almost identical to zirconium, hafnium (element 72) differs by absorbing neutrons strongly, so it is used in control rods, notably for naval reactors. In 2007 hafnium-based dielectrics began replacing silicon dioxide in transistor gates, enabling smaller, less leaky chips; it also strengthens nickel superalloys.
Example: The 45 nm process introduced a high-k gate dielectric based on Hf oxide.
Dirk Coster and George de Hevesy found hafnium in 1923 in Copenhagen by X-ray spectroscopy of zirconium ore, guided by Niels Bohr's prediction that element 72 would resemble zirconium rather than the rare earths. The name comes from Hafnia, the Latin name for Copenhagen. Separating hafnium from zirconium for nuclear-grade cladding is difficult and costly.
Related abbreviations
More cardiology abbreviations
- GXT – Graded exercise test
- HAS-BLED – Hypertension, Abnormal kidney or liver function, Stroke, Bleeding…
- HBP – High blood pressure
- HCM – Hypertrophic cardiomyopathy
- HFimpEF – Heart failure with improved ejection fraction
- HFmrEF – Heart failure with mildly reduced ejection fraction
- HFpEF – Heart failure with preserved ejection fraction
- HFrEF – Heart failure with reduced ejection fraction
See all 229 cardiology abbreviations →
More physics abbreviations
- GUT – Grand unified theory
- GW – Gravitational wave
- h – Planck constant
- HEP – High-energy physics
- IR – Infrared
- ITER – International Thermonuclear Experimental Reactor
- kB – Boltzmann constant
- KE – Kinetic energy
See all 68 physics abbreviations →
This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.