IEC plug type classifications by letter
International plugs used for mains electricity are sometimes classified by letters. This is used by the International Electrotechnical Commission (IEC) and also historically by the US State Department.
These plug types refer to the IEC standards Plugs and socket-outlets for domestic use, i.e. the male plug that fits a country-specific domestic electrical wall socket. However, the list is far from comprehensive, includes several errors, and groups together several plugs that are not interchangeable or are even unsafe.
Different organisations may also use different letters for different plug types. Other than for superficial recognition, we strongly recommend against using this system.
See our product finder pages for full details of which plug is used where.