「円」(en) means "yen," which is the official currency of Japan. You always place "円" after the number when stating an amount of money. For example, 「五百円」(gohyaku-en) means "five hundred yen." It's essential for transactions.

「円」（えん）は日本の通貨単位です。金額を表す時に数字の後に付けます。例：「五百円」（ごひゃくえん）。