Tang Yun (Tang Dynasty Rhymes), Jiyun (Collection of Rhymes), and Yunhui (Gathering of Rhymes) denote the pronunciation as fen (level tone). This is another name for the board on the side of a balance. Also, Tang Yun (Tang Dynasty Rhymes) and Jiyun (Collection of Rhymes) denote the pronunciation as fen (falling-rising tone). This is the wood at the side of a boat. Also, Jiyun (Collection of Rhymes) denotes the pronunciation as fen (falling-rising tone). According to the Guangya (Broad Refinement), fen is equivalent to fu.