¥

YEN

["This currency is named after a word meaning \"round object\" and is used by the world's third-largest economy."]

The symbol "¥" is the currency sign for the Japanese yen, which is why the answer is "YEN." It’s a direct representation—no wordplay or tricks here—just the standard abbreviation for Japan’s official currency. You’d see this symbol on price tags, financial reports, or anywhere yen amounts are listed.