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three; 3
「参」 has another reading with different meanings.
Chinese "Three Stars" constellation (one of the 28 mansions)
参さんの数字すうじを書いかいてね。
Write the number three.
参さんつの箱ばこを持っもってきた。
I brought three boxes.
書類しょるいには金額きんがくを参さん万まん円えんと記入きにゅうしてください。
Please enter the amount as thirty thousand yen on the form.