The Cook Islands, a sovereign state in free association with New Zealand, uses two official legal tender currencies. The New Zealand Dollar circulates in parallel with the local Cook Islands Dollar; at the same time, the government also authorises many legal tender coins in the Cook Islands Dollar currency for collector's purposes. Many of them are in standard bullion sizes, including one ounce of silver - such as this coin.
The Mint says about this coin:
What does a key mean for you? The symbolic range is extremely wide. At its heart, a key is an opener of locks. Whether it's a door, a treasure chest, or the metaphorical heart, keys let us into unknown worlds and reveal secrets. In Eastern Europe keys were hung upside down over beds to ward off bad dreams. Jewish midwives used to give a key to a woman in labour to encourage safe delivery of the baby. Several cultures have buried their dead with keys to unlock the afterlife. The ancient Greeks saw keys as symbols of knowledge. Today they are also traditionally given to graduates, and indeed anyone at the threshold to their next adventure.
In modern romantic notion a key is often considered as “the key to my heart”. This is a love symbol much like the heart symbol. So whatever the occasion, thanks to the enhanced smartminting technology you can use this 1 oz coin in antique finish to make your own meanings. | 
Search for Cook Islands: Silver Ounce 2022 Key to my Heart on eBay 