A. M. Honeyman, Epigraphic South Arabian Antiquities, Journal of Near Eastern Studies, XXI, No. 1, January 1962, pp. 38-39, pl. III.
The use of the bull's head, symbolizing the Moon god, appears to be employed for apotropaic or protective purposes, and is regularly found in the funerary art of Hayd ibn 'Aqil, near the Qatabanian capital of Tamna'.