High Swirl Combustion 
Hardware Systems Command 
Health and Safety Commission 
High Speed Channel 
Homeland Security Council 
Human Systems Center 
Hardware/Software Coordination 
Health and Safety Code 
Health Services Command 
Hierarchical Storage Controller 
Headquarters and Supply Company 
High Speed Connector 
High-Speed Craft 
Hardware System Command 
Health Sciences Center 
Health Service Commissioner 
hematopoietic stem cells 
hepatic stellate cells 
Herschel Science Centre 
High Speed Connect 
Higher School Certificate 
Hospital for Sick Children 
Host System Component 
hysteroscopy 
haematopoietic stem cell 
haematopoietic stem cells 
haemopoietic stem cell 
haemopoietic stem cells 
Hall Social Coordinator 
Hampden-Sydney College