In the historical Chinese dictionary Longkan Shoujian (龍龕手鑑), this character is written in the form of .

(radical 9, +5, 7 strokes, cangjie input 人木一 (ODM), four-corner 25230, composition)

Phono-semantic compound (形聲, OC *bɯːnʔ): semantic (person) + phonetic (OC *pɯːnʔ).

This character was originally an alternative form of as used in Chinese. This usage now appears to be obsolete, at least in Japanese, where and are distinct characters and are not interchangeable. See the Chinese and Japanese entries for further details.