Yotta-

Yotta is the largest decimal unit prefix in the metric system, denoting a factor of 1024 or ; that is, one million million million million, or one septillion. It has the unit symbol Y. The prefix name is derived from the Ancient Greek (), meaning "eight", because it is equal to 1,0008. It was added as an SI prefix to the International System of Units (SI) in 1991.
Usage examples: