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, bullion and collector 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 - typically, one ounce of silver (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum). Many of these feature movie characters. Some are also in innovative shapes, such as "Chibi".
Chibi (ちび or チビ) is a Japanese slang word describing something short (a thing, an animal or a person). The term is widely used to describe a specific style of caricature where characters are drawn in an exaggerated way: small and chubby, with stubby limbs and oversized heads. Coins of this type look like cartoon characters and have their corresponding shape; they are also very thick for their size.
This coin features Biff Tannen, a character in the cult film Back to the Future. It is in "Comic Style", very similar (but not exactly the same) to the Chibi style.
The film classic by director Robert Zemeckis about the time travel of the mad scientist Doc Brown and the young Marty McFly inspired millions of cinema visitors worldwide in the 1980s. Even today the trilogy still enjoys cult status. Released to its 35th anniversary, this coin shows Martin Seamus McFly, a fictional character and the protagonist of the Back to the Future trilogy.
To celebrate the significance of 88 mph - the speed the DeLorean must reach to initiate time travel, only 888 coins were released. | 
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