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 "Hepta" never received official sanction and is obsolete.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
Tera Pass Tera Pass The Tera Pass is the primary route connecting Logar and Paktia provinces in Afghanistan. The pass was unimproved until 2006, when construction of a paved surface was completed as part of the ongoing international reconstruction effort. The pass has been in use since Antiquity, and serves as one of the primary passes connecting Kabul to India. Unlike the Khost-Gardez Pass to the south, the Tera Pass is only sporadically inhabited. Alternate passes exist through Logar's Kharwar district to the west. The pass crosses a rugged mountain ridge with nearby peaks topping out at 11,000'. The pass itself rises