High Color Rendering Index
high color rendering fluorescent lamp
high and very high frequency direction finding
high and medium frequency diagraphic meter used for television
high and low frequency information
high accuracy frequency stabilization
high accuracy frequency measurement
High - frequency meld light - H - Steel
HHF Hyper – High Frequency
HFT High Frequency Transceiver
HFSS High Frequency Structure Simulator
HFRT High Frequency Radio Transmitter