also: うん
noun, used as a prefix
some; a certain; umpteen
Used as a placeholder for an unspecified digit or number, often in casual or colloquial expressions. Common in patterns like ン十万円 (some hundreds of thousands of yen) or 50ン歳 (fifty-something years old).
あの車はン百万円はするらしい。
That car apparently costs some millions of yen.
彼は50ン歳くらいに見える。
He looks around fifty-something years old.