Popularity	Country/ Region	Term	Definition	Main Category	Subcategory
		HDD	Horizontal Directional Drilling	Academic & Science » Architecture & Constructions
		HDF	High Density Fiberboard	Academic & Science » Architecture & Constructions
		HDF	Heringsdorf Airport	Transport & Travel » Airport Codes
		HDF	Hierarchical Data Format	Computing » File Extensions
		HDF	Hadfield	Transport & Travel » Railway Station Codes
		HDF	Hereditary Disease Foundation	Associations & Organizations » Non-Profit Organizations
		HDF	Hôtel-Dieu de France	Medical » Hospitals
		HDF	Hungarian Defence Forces	Governmental » Military
		HDF	Hubble Deep Field	Academic & Science » Astronomy & Space Science
		HDF	Hydrodefluorination	Academic & Science » Chemistry
		HDF	Human Development Foundation	Associations & Organizations » Regional Organizations
		HDFC	Housing Development Finance Corporation	Business » Banking
		HDFC	Housing Development Fund Corporation	Business » Finance
		HDFS	Hadoop Distributed File System	Computing » Data Storage
		HDFS	Human Development and Family Studies	Academic & Science » Courses
		HDFS	Harley-Davidson Financial Services	Business » Companies & Corporations
		HDFS	Hubble Deep Field South	Academic & Science » Astronomy & Space Science
		HDFS	Humpty Dumpty Falls Scale	Medical » Paediatrics & Child Health
		HDFS	Hellenic Duty Free Shop	Business » Companies & Corporations
		HDI	Human Development Index	Governmental » Census & Statistics
		HDI	High Density Interconnect	Academic & Science » Electronics
		HDI	Help Desk Institute	Associations & Organizations » Professional Associations
		HDI	Hexamethylene Diisocyanate	Academic & Science » Chemistry
		HDI	Heidi Device Interface	Computing » Sofware & Applications
		HDI	Humpty Dumpty Institute	Associations & Organizations » Non-Profit Organizations