HAAT
This denotes the Height Above Average Terrain and is used to describe how high a signal is being broadcasted from.

HAVi
HAVi is a networking standard that uses IEEE 1394, aka Firewire, as a transport. If implemented precisely, HAVi will allow devices of different brands to connect using FireWire and interoperate by sending audio, video and control information over the network. However, 1394/HAVi is not is not even close to being a standard when it comes to home audio and video!

HDCP
High Definition Copy Protection. Take a look at the term 'DVI / HDCP' for more information.

HDMI
Backed by some of the industry's biggest names, High-Definition Multimedia Interface (HDMI) will enable true high definition audio/video content for consumers. Content providers, system operators and consumer electronics manufacturers are rallying behind a standard that will finally deliver on DTV's long-awaited promises.

HDVP
High-Definition Video Processor. This is a video processor that can transform your computer into a HD home entertainment system. This is a special version of a GPU for your computer.

Head End
This is where a cable system receives programming from various sources. It then combines these sources onto its cable, assigns channel numbers and sends it off to the customers. Essentially it is where the transmissions begin on a cable network.

Height
The height of your TV. This includes the chassis of the TV and does not describe the actual viewing area of the television by any means. For sizing of a television check out the term ‘Horizontal Viewing Angle’.

Horizontal Viewing Angle
This is how you measure the size of a television, monitor or display device. If a television is said to be 42 inches, this means from one corner to the opposite corner, the actual viewable screen measures 42 inches. To make this measurement, take a tape measure from the bottom-left corner to the upper-right corner to find out the specific size. Note: you can make the exact same measurement from the upper-left corner to the bottom-right corner and the result will be the same.

HTPC
Home Theater Personal Computer. This is a device many people are starting to use in place of their Progressive Scan DVD player, Line Doubler, Video Scaler/Processor, HDTV Tuner/STB (Set Top Box) and video game console.