In the field of Computer Science HHD stands for Hybrid Hard Drive..
In the field of Computer Science GPL stands for General Public License..
In the field of Computer Science GPRS stands for General Packet Radio Service..
In the field of Computer Science GPU stands for Graphics Processing Unit..
In the field of Computer Science GUI stands for Graphical User Interface..
In the field of Computer Science HAL stands for Hardware Abstraction Layer..
In the field of Computer Science HCI stands for Human-Computer Interaction..
In the field of Computer Science HD stands for High Density..
In the field of Computer Science HDD stands for Hard Disk Drive..
In the field of Computer Science HD DVD stands for High Definition DVD..