yotta- [YAH tuh or maybe YOH tuh]

(Greek: from octo-, "eight"; a decimal prefix used in the international metric system for measurements)

yotta- [YAH tuh or maybe YOH tuh] (Greek: from octo-, "eight"; a decimal prefix used in the international metric system for measurements).

Adopted by the Conference General des Poids et Mesures [CGPM] in Paris at its 19th meeting in October, 1991. This prefix is used in the metric [decimal] system as septillion [U.S.] or quintillionfold [U.K.], 10²⁴ [1 000 000 000 000 000 000 000 000]. The metric symbol for yotta- is Y. "The names yocto and yotta are derived from octo, suggesting the number eight [the eighth power of 10³]; the letter 'y' is added to avoid the use of the letter 'o' as a symbol because it may be confused with the number zero." Bureau International des Poids et Mesures, 1990, document #10, pp. 44-45.

yottabit (Ybit, Yb)

A unit of information equal to 10²⁴ bits (Binary DigIT, a single digit number in base-2 [a zero or a one] and is the smallest unit of computer data).

yottabyte (s) (noun), (YB) yottabytes (pl)

Approximately 10²⁴ power bytes: "The yottabyte is the largest unit of measurement for computer data."

yottagram, Yg

1. One yottagram, approximately the "mass of water in the Pacific Ocean".
2. Mass of earth equal to about 6 000 yottagram.

— Source for this and other yotta words: Chemistry and Molecular Biology Resources,
UC Extension, Berkeley/San Francisco

yottajoule (YJ)

Four hundred yottajoule approximates the energy given off by the sun in one second.

yottaliter (YL)

One yottaliter equals the volume of earth.

yottameter (Ym)

A metric unit of distance equal to 10²⁴ meters or 10²¹ kilometers. One yottameter equals 32.408 megaparsecs (Mpc) or 105.7 million light years.

It is said that we probably do not need a longer distance unit term than the "yottameter", because the radius of the observable universe is not more than about 200 yottameters.

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