The letter symbols of IEC 27-2A concerning static convertors have been adapted in a standard within the set of standards DIN 1304. DIN 1304 part 8 is part of the adoption of CENELEC HD 245.2.
DIN 1304-8:1994 history
1994DIN 1304-8:1994-02 Letter symbols for physical quantities; symbols for use in the field of static converters using semiconductor devices
1994DIN 1304-8:1994 Letter symbols for physical quantities; symbols for use in the field of static converters using semiconductor devices