Vajrayana Iconography
The tradition and custom of the jhator afforded Traditional Tibetan medicine and thangka iconography with a particular insight into the interior workings of the human body. Pieces of the human skeleton were employed in ritual tools such as the skullcup, thigh-bone trumpet, etc.
The 'symbolic bone ornaments' (Skt: aṣṭhiamudrā; Tib: rus pa'i rgyanl phyag rgya) are also known as "mudra" or 'seals'. The Hevajra Tantra identifies the Symbolic Bone Ornaments with the Five Wisdoms and Jamgon Kongtrul in his commentary to the Hevajra Tantra explains this further.
Read more about this topic: Sky Burial