BN — Brunei

Brunei is a small, wealthy sultanate on the island of Borneo in Southeast Asia, divided into two parts by the Malaysian state of Sarawak. Bandar Seri Begawan is the capital. Brunei's wealth comes primarily from oil and natural gas, giving it one of the highest GDP per capita in the world. The Brunei Dollar (BND) is pegged at par with the Singapore Dollar, and both currencies are accepted in both countries. For developers, the BN country code maps to the ms-BN locale for Brunei Malay. The .bn domain and +673 calling code serve Brunei. The BND-SGD currency interchangeability agreement is unique — it's not just a peg but a mutual acceptance agreement where each country accepts the other's currency at face value. This has implications for dual-currency payment systems. Brunei's full official name is exceptionally long, making it a good edge case for testing country name display truncation in UI elements.