[1] Harddisk Controller

[2] Honeywell Digital Computer (Chip)

[3] Henry Draper Catalogue {Astronomie}

[4] Hierarchical Distributed Control

[5] Highly Developed Country

[6] Hybrid Device Controller

[7] Hydrodynamic Chromatography

[8] Hasselblad Data Camera (->"NASA Acronym List") {Astronomie}