National Insurance number
The National Insurance number is a number used in the United Kingdom in the administration of the National Insurance or social security system. It is also used for some purposes in the UK tax system. The number is described by the United Kingdom government as a "personal account number".
Centrelink
Centrelink commenced initially as a government agency of the Department of Social Security under the trading name of the Commonwealth Services Delivery Agency in early 1997. Following the passage of the "Commonwealth Services Delivery Agency Act 1997", the Centrelink brand name came into effect in late 1997. Offices were established nationally to manage services to people in need of social security payments.