Receptacle

From Memory Alpha, the free Star Trek reference.

A receptacle was a spherical device which could house a non-corporeal lifeform.

In 2268, the entities Sargon, Thalassa, and Henoch were in a subterranean cave on Arret, stored in receptacles, three of a group of survivors of a cataclysmic war. The other entities had long since fled their receptacles. (TOS: "Return to Tomorrow")