The mechanical shell built by the Medusan Zero to hold their non-corporeal form, shielding others from the sight of a species whose true appearance drives humanoids insane.
Medusans are beings of energy, and a glimpse of one unprotected causes madness. Zero, captured by the Diviner and used as a weapon against prisoners on Tars Lamora, escaped and assembled a containment suit out of scrap, with a rounded body, a single viewing port and manipulator arms.
The suit is seen throughout the first season of Star Trek: Prodigy, beginning with Lost and Found. It allows Zero to live and work alongside the rest of the Protostar crew.
In A Moral Star, Zero opens the suit deliberately to overwhelm the Diviner, but Gwyn is hurt when she catches a reflection. A sleeker suit later replaces the original, and the second season explores Zero's wish for physical sensation.