IEC 80000-13:2008 is an international standard that defines quantities and units used in information science, and specifies names and symbols for these quantities and units. The standard is published by the International Electrotechnical Commission (IEC) and is part of the group of standards called ISO/IEC 80000, published jointly by the IEC and the International Organization for Standardization (ISO). 
It is divided into the following chapters:
- Normative references
- Names, symbols and definitions
- Prefixes for binary multiples
This Standard includes definitions for units relating to information technology, such as the erlang (symbol E), bit (bit), octet (o), byte (B), baud (Bd), shannon (Sh), hartley (Hart) and the natural unit of information (nat). Clause 4 of the Standard defines the standard binary prefixes used to denote powers of 1024 from 10241 (kibi) to 10248 (yobi).
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