Harmonic resonance chamber

The Harmonic Resonance Chamber is a device designed to contain and stabilize the Omega molecule.

Originally designed by the Borg, they had not actually built one as of 2374 due to having no Omega molecules for use. The first one constructed was by Seven of Nine onboard the USS. 

The Confederation of Earth created a full size and a microsized harmonic resonance chamber (to power the Genesis Device portion of the Genesis Sphere), the full sized harmonic resonance chamber was returned to the Delta Quadrant to a planet unknown.