"Wuyan" is used for the fanqie pronunciation in the "Tang Yun" (Tang Yun), and "yu yan" is used in the "Ji Yun" (Ji Yun). The pronunciation is the same as "yan" (yàn). "Shuowen Jiezi" (Shuowen Jiezi) explains it as the color of flames. Additionally, "wu gan" is used for the fanqie pronunciation in the "Guang Yun" (Guang Yun), and "yu gan" is used in the "Ji Yun" (Ji Yun). The pronunciation is the same as "an" (àn). "Yupian" (Yupian) explains it as fire. This character is sometimes also written as [].