Singapore
In Singapore the National Registration Identity Card (NRIC) is issued to all Singapore citizens and permanent residents. Permanent residents (PR) are issued with NRIC number similar to citizens.
The NRIC contains a unique number that identifies the person holding it, and is used for almost all identification purposes in Singapore, including authentication when accessing the Singapore government's web portal. Citizens and permanent residents are issued with identity number starts with prefix S (born before 2000) and T (born in or after year 2000), followed with a 7-digit number and a checksum alphabet. For citizens and permanent residents born after 1968, the first two digits of the 7-digit number indicate their birth year.
Long-term pass holders (e.g. people holding work permits, employment passes or student passes) are issued a similarly formatted Foreign Identification Number (FIN) on their long-term passes, with prefix F (registered before year 2000) and G (registered in or after year 2000).
Read more about this topic: National Identification Number