Zetta- Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning "seven". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, "hepta", was informally introduced a few years before the promulgation of zetta. It was formed from the Greek (), also meaning "seven". "Hepta" never received official sanction and is obsolete. Zeta (), although
Angolalla Tera Angolalla Tera Angolalla Tera is one of the woredas in the Amhara Region of Ethiopia. It is named in part after one of the capitals of the former principality of Shewa, Angolalla. Located at the eastern edge of the Ethiopian highlands in the Semien Shewa Zone, Angolalla Tera is bordered on the south by Hagere Mariamna Kesem, on the west by the Oromia Region, on the north by Basona Werana, and on the southeast by Asagirt. The administrative center of this woreda is Chacha. Angolalla Tera was part of former Angolalla Terana Asagirt woreda. Based on the 2007 national census