A radion beam was a type of energy beam that could penetrate shields.

In 2372, Harry Kim modified the USS Voyager's main deflector to fire dozens of radion beams into the shields around a Mokra Order prison facility on a planet, where Tuvok and B'Elanna Torres were being held. One of the beams was to conceal a transporter signal for a rescue team, with the others being decoys. Unfortunately, Voyager was driven off by the Mokra Order's phased ion cannons before the plan could be completed. (VOY: "Resistance")

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