Kroner is the official currency of Denmark, Norway, and Sweden. However, this term is not used in other countries, and instead, different terms are used to refer to these currencies. In Denmark, the kroner is often referred to as "krona," while in Norway, it is sometimes called "krone." Furthermore, there are also slang terms used for this currency, such as "crowns" or "bucks" in English and "lapp" or "spänn" in Swedish. Additionally, some Nordic languages, such as Finnish and Icelandic, use their own words to refer to these currencies. Overall, there are many different terms used to refer to kroner in different languages and regions.