What are the world coins?
Could you elaborate on the concept of "world coins" for those who are unfamiliar with the term? Are they referring to currencies used globally or a specific set of coins that have historical, cultural, or monetary significance? If it's the latter, could you provide some examples and discuss why they are considered significant? Are there any specific countries or regions where these coins originate from, and what makes them stand out among other coins? Additionally, how do world coins fit into the current global financial system, and are they still actively used or more of a collector's item?