Exa
Exa is a prefix in the International System of Units (SI) representing 10^18, or one quintillion. The symbol for this prefix is E. It sits between peta (10^15) and zetta (10^21) in the SI prefix series and is used to express very large quantities across various fields. In decimal-based conventions, an exabyte equals 10^18 bytes, and an exajoule equals 10^18 joules. The prefix was standardized as part of the SI in 1960 and is commonly seen in contexts such as data storage, energy, and computing performance. The name and symbol follow the established pattern for SI prefixes.
In computing and information technology, exa- is frequently encountered in discussions of scale and capacity. Terms
exa is also the name of a modern command-line tool designed to replace the traditional ls command