Latin small letter beta with palatal hook, rare pre-1989 IPA symbol for [χʲ] or [χ͡j] (or [ꭓʲ] or [ꭓ͡j]), as in Eugénie J. A. Henderson, "A Phonetic Study of Western Ossetic (Digoron)", Bulletin of the School of Oriental and African Studies, 13(1), 36-79, 1949 . The hook has been raised a bit in the drawing.
Own work
Moyogo