2019IEC 60027-2:2019 Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
2005IEC 60027-2:2005 Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
2000IEC 60027-2:2000 Letter symbols to be used in electrical technology - Part 2 : Telecommunications and electronics
1999IEC 60027-2/AMD2:1999 Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics; Amendment 2
1972IEC 60027-2:1972 Letter symbols to be used in electrical technology. Part 2 : Telecommunications and electronics
IEC 60027-2/AMD2:1999 Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics; Amendment 2 was changed to IEC 60027-2:2000 Letter symbols to be used in electrical technology - Part 2 : Telecommunications and electronics.