Why do South Africa domain names end in za
Why do South African domain names end in .za and not sa?
South Africa was a signatory to the 1968 Vienna Convention on Road Signs and Signals. That was the convention that chose the country codes for those oval stickers on cars that tell you where the car is from.
The country codes were established by the International Standards Organisation (ISO) before the domain name system. At the beginning of the DNS in the USA, computer scientists chose to adhere to all International standards, and therefore allocated .za to South Africa because .za was the country code already listed for South Africa.