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.
The Mint says about this coin:
The most eccentric and often rather flaky member of the Friends gang is here! The fourth release in the Friends Chibi Coin series includes the aspiring musician and good-natured masseuse, Phoebe Buffay. Phoebe is known for sometimes telling her friends outlandish tales of her days on the street and singing songs with somewhat unusual lyrics at the coffee shop.
Created in partnership with Warner Bros. Consumer Products, the 1oz pure silver coin showcases Phoebe playing her guitar and has been shaped and coloured to resemble her as Chibi art. To confirm the coin is legal tender, the Ian Rank-Broadley effigy of Her Majesty Queen Elizabeth II is finely engraved on the obverse of the coin and a Certificate of Authenticity is printed on the box.
The coin arrives in a Friends-themed box and includes a large window, ideal for display. At the back of the box, you will find the coin’s unique serial number in the limited mintage of 2,000 coins. | 
Search for Niue: Silver Ounce 2022 Chibi - Friends: Phoebe Buffay on eBay 