Niue, a sovereign state in free association with New Zealand, uses two official legal tender currencies. The New Zealand Dollar is the circulation currency for daily transactions, while the government also authorises legal tender coins in the Niue Dollar currency for collector's purposes.
A number of mints issue a large variety of commemorative, collector and bullion coins under the authority of Niue. These coins are dedicated to historical or general popular culture themes not related to Niue itself. Many of them are in standard bullion sizes based on the troy ounce - such as the mini-coin format of one twenty-fifth of an ounce of gold (abbreviated as 1/25 oz Au, where "Au" comes from the Latin word for gold, Aurum).
The coins listed here are considered "bullion" because they are issued at prices close to the intrinsic value of the precious metal they are made of, and are targeted at bullion investors.