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From Wiki-FL

HDSL - See high bitrate digital subscriber line.
Hertz - See frequency.
hybrid fiber/coax (HFC) - A type of network that includes coaxial cables to distribute signals to a group of individual locations (typically 500 or more), and a fiber optic backbone to connect these groups.
high bitrate digital subscriber line (HDSL) - A symmetric DSL technology that provides a maximum bandwidth of 1.5 megabits per second in each direction over two phone lines, or 2 Megabits per second over three phone lines.
high bitrate digital subscriber line II (HDSL II) - A descendant of HDSL which offers the same performance over a single phone line.
high-definition television (HDTV) - Any television system that provides a significant improvement in picture quality over existing television systems. Most HDTV systems offer more than 1,000 scan lines, in a wider aspect ratio, with superior color and sound fidelity.
HTML - See hypertext markup language.
HTTP - See hypertext transfer protocol.
hypertext - Documents or other information with embedded links that enable a reader to access tangential information at specific points in the text.
hypertext markup language (HTML) - The computer language used to create hypertext documents, allowing connections from one document or Internet page to numer-ous others. HTML is the primary language used to create pages on the World Wide Web.
hypertext transfer protocol (HTTP) - The first part of an address (URL) of a site on the Internet, signifying a document written in Hypertext Markup Language (HTML).
Hz - See frequency.