tera

Tera is a unit prefix in the metric system denoting multiplication by 1012 or 1000000000000 (one trillion short scale; one billion long scale). It has the symbol T. Tera is derived from the Greek word τέρας teras, meaning "monster". The unit prefix was confirmed for use in the International System of Units (SI) in 1960.
Examples of its use:

terahertz radiation: electromagnetic waves within the band of frequencies from 0.3 to 3 THz. Visible light is around 500 THz.
terabit and terabyte, units used in data storage.
teragram: equal to 109 kg. The Great Pyramid of Giza has a mass of about 6 Tg.
terasecond: approximately 31,558 years
teralitre: equal to 109 m3. Lake Zurich contains about 4 TL of water.
terawatt: used to measure total human energy consumption. In 2010 it was 16 TW (TJ/s).
terametre (= 1,000,000,000 km): Light travels 1.079 Tm in one hour.

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