Yin Collection, Middle Volume
Radical: Woman (nǚ)
Page 158, Entry 09
The Jade Chapters (Yupian) records this as an ancient form of the character pronounced nu (rising tone). See the entry for the character pronounced nu (rising tone) for notes.
Also, Collected Rhymes (Jiyun) records that the ancient form of the character pronounced wu (rising tone) is written as this character. See the entry under Radical: Person (rén), seven strokes, for detailed notes.