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| HAPS | High Altitude Platform Station | HDFS | High Density Fixed Service | HDFSS | High Density Fixed-Satellite Service | HDTV | High Definition TeleVision | HDTP | Hoofddirectie Telecommunicatie en Post van het Ministerie van Verkeer en Waterstaat (NL) | HEO | Highly inclined Elliptical Orbit | HF | High Frequency (frequency range 3 to 30 MHz) | HFBC | High Frequency Broadcasting | HIPERLAN | High Performance Local Area Network | HLC | High Level Commitee (ITU) | |