Zetta- the 6th letter of the modern and classical Greek alphabet, denotes a value of seven (7) when used as a numeral. Examples: 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
Tera Pass approximately 3,500' from the lowest part of Logar, and descends approximately 2,000' into the Gardez river valley to the south. The pass receives heavy snowfall during the winter months, often to the point of being impassable. Snow tends to persist into the summer months on the north-facing side of the mountain ridge. The Tera Pass area is largely uninhabited, with only minor settlements on the north side of the pass. The pass is relatively secure, owing to the presence of ANP checkpoints, daunting geography and paved surface, which makes IED attacks more difficult. Tera Pass The Tera Pass is the