Terrestrial literally means 'of the earth' and is used in a variety of contexts:
- In broadcasting terrestrial indicates that TV or radio signals are received through a conventional aerial. See terrestrial television.
Terrestrial television is a term which refers to modes of television broadcasting which do not involve satellite transmission.
- In communication networking, "terrestrial" indicates signals travelling through fiber optic cable or copper wire, usually located underground or undersea.
- In space exploration, "terrestrial" indicates materials or objects of Earthly origin, as opposed to, for example, meteorites that are found on the Earth but originated elsewhere in the solar system.
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