The symbiote tank ringed into the council room.
The Symbiote Tank was a container that was capable of holding a Goa'uld Symbiote.
Overview
The imagery on the container.
The tank was a large pillar with a domed shaped container at its top. At the top of the dome was a number of shapes crafted onto its surface that resembled a large number of Goa'uld symbiotes. The opening at the top of the tank was capable of being removed which allowed a person to see the symbiotes inside which swam in a watery based substance.
History
Symbiotes inside the tank.
Daniel Jackson snuck onboard the Goa'uld space station in the Hasara system and found the symbiote tank waiting by a ring transporter. At the High Council of System Lords meeting that discussed Anubis's entry into the ranks of the System Lords, a symbiote tank was ringed into the council room.
Osiris and the assembled Goa'uld then began to ritually consume the symbiotes that were present within the tank. (SG1: "Summit")