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IEC 60027-3:2002 ed3.0

Действует
Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units — 25 стр.
Applies to logarithmic quantities and units. Quantities that can be expressed as the logarithm of a dimensionless quantity, such as the ratio of two physical quantities of the same kind, can be regarded and treated in different ways. In many cases, differences do not affect practical treatment.
ICS
01.075 Character symbols / Знаковые обозначения
01.060 Quantities and units / Величины и единицы измерения