In this picture, the dinumug fertility and prosperity amulet is worn by this Ifugao women in modern times. The center of the dinumug has a form that is the image of the female uterus. The BA symbol’s shape is the outline of the center of the dinumug. More details and info on BA, dinumug and the fertility symbol’s implications at Fertility Symbols, Feminine Principle and BA.
Photograph copyright: F. de Jager
(Source: http://www.kipas.nl/Beads/BontFertSym.htm)