A poisonous liquid acid composed of hydrogen and fluorine. Hydrofluoric acid [HF] is used primarily because it is the only common, inexpensive mineral acid that can dissolve siliceous minerals. HF is [..]

High frequency

Have Fun

Hard Flamer

How Funny, only used in a sarcastic way.

HF is short for hooker face. A term used to describe a chick that resembles a hooker in the face posibly due to too much makeup or drug use.

Have fun

High Frequency radio communication services from 1.8 to 29.7 MHz, used for long-range communications, the only band used for worldwide communcations other then mircowave and UHF satellite services

have fun

Abbreviation for high frequency. See radio frequency band.

   have fun

Definition HF is computer slang for the phrase "Have Fun".

Abbreviation for high frequency.

Dictionary of Computer and Internet Terms Have fun.

have fun

(n) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons(n) 3 to 30 megahertz

High Frequency.

High Frequency

High Frequency 

1. High Frequency. Electromagnetic frequencies in the range of 3 to 30 megaherz. 2. Human Factors. The physical and psychological requirements of human beings that must be considered when designing co [..]

Halogenated plastics (ie. those that contain chlorine, fluorine, bromine, iodine and astatine) when ignited will tend to release toxic and corrosive gases, which has potential safety implications, eg. obstruction of escape routes. Halogen free plastics, as the name suggests, do not contain halogens.

High Frequency 

High Frequency.

High Frequency (radio communication)

Human Factors

Any of the radio frequencies in the band between 3 and 30 MHz. Hierarchically Complete Source Routing

Hedge Fund

Have fun, a common courtesy at the start of a match. Often combined with 'good luck'

Hydrogen Fluoride

High frequency. A method of long-range radio broadcast.

High Frequency

High Frequency

Hemlock fir species of framing lumber.

High Frequency

High Frequency Radio Equipment

High Frequency

High Frequency communications radio. Used to communicate with air traffic control agencies when out of VHF communications radio range using the frequency range 3 – 30MHz. Newer model aircraft are now using datalink systems for this purpose. See CPDLC. Here is Wikipedia’s discussion of HF.

High Frequency radio equipment.

Have Fun.

Have fun.

See high frequency. definition courtesy of: NWS Space Weather Prediction Center

Hydraulic Fracturing

High Frequency

Hydraulic fracturing

Hydrogen Fluoride HLW

High Frequency: radio wave whose frequency is between 3 and 30 megahertz