ISO/IEC 80000
[23][24] According to the standard, symbols for quantities are "generally single letters from the Latin or Greek alphabet" and are "written in italic (sloping) type".[25] It specifies mathematical symbols, explains their meanings, and gives verbal equivalents and applications.[35] It gives names, symbols, definitions and units for quantities used for light and optical radiation in the wavelength range of approximately 1 nm to 1 mm.It has a scope; normative references; names, definitions, and symbols; and prefixes for binary multiples.Quantities defined in this standard are: The standard also includes definitions for units relating to information technology, such as the erlang (E), bit (bit), octet (o), byte (B), baud (Bd), shannon (Sh), hartley (Hart), and the natural unit of information (nat).It further clarifies that "ISQ is simply a convenient notation to assign to the essentially infinite and continually evolving and expanding system of quantities and equations on which all of modern science and technology rests.In the standard, the application of the binary prefixes is not limited to units of information storage.