SG — Singapore

Singapore is a city-state in Southeast Asia, one of the world's most important financial centers and trade hubs. Despite its tiny area (733 sq km), Singapore has one of the world's highest GDP per capita and most efficient business environments. The Singapore Dollar (SGD) is interchangeable with the Brunei Dollar by agreement. For developers, the SG country code maps to en-SG for Singapore English, zh-SG for Simplified Chinese, ms-SG for Malay, and ta-SG for Tamil — four official languages. The .sg domain and +65 calling code serve Singapore. Singapore's NRIC (National Registration Identity Card) number has specific format and validation rules. The country's Smart Nation initiative makes it one of the world's most digitally advanced governments. Singapore's multilingual nature (four official languages) and multicultural population require comprehensive localization. PayNow, Singapore's real-time payment system, is widely adopted. Singapore's position as an Asian tech and finance hub makes SGD and en-SG among the most important APAC locale/currency pairs.