Boridium

The element Boridium has a symbol of Bo, an atomic weight of 317, the atomic number 121, and was originally discovered on Rigel IV.

This metal is part of the trans-uranic series of heavy elements.

Used in both Federation and Romulan technology, it has been used for everything from Romulan mines to Federation exocomps, to Romulan drone-ships.

Other Uses:

• The Hill People Rigel IV use boridium for the blades of a kind of knife they produce.

• The Romulan prison camp on Carraya IV tracked prisoners' locations by using the energy signatures of boridium pellets implanted beneath the skin.