IEC 60027-1-1992 Letter symbols to be used in electrical technology Part 1: General

This standard has been prepared by IEC technical committee 25: Quantities and units, and their letter symbols.
This standard forms the sixth edition of IEC 27-1* and supersedes the fifth edition issued in 1971, Amendments No. 1 (1974), No. 2 (1977), No. 3 (1981), No. 4 (1983) and the first supplement (Publication 27-1A (1976))...
Annexes A, Band C of this International Standard are nonnative; Annexes D, E, F and G are informative:
IEC 27 consists of the following parts, under the generaltitle Letter symbols to be used in elec­trical technology:
Part 1: General
Part 2: Telecommunications and electronics
Part 3: Logarithmic quantities and units
Part 4: Symbols for quantities to be used for rotating electrical machines
This part 1 of the International Standard, IEC 27, gives information about general quantities, units and their letter symbols and mathematical symbols that are to be used in electrical technology. It also gives rules for writing and printing these symbols and for the use of additional marks (subscripts, superscripts, etc.) with symbols for quantities.
There are no normative references quoted in this International Standard.