Polaron grid
From Memory Alpha, the free Star Trek reference
A polaron grid is a type of protective energy field, based on polarons.
Taresia is surrounded by a high-density polaron grid, projected by a network of satellites. In 2373, the Taresians raised the grid to prevent the USS Voyager from retrieving Ensign Harry Kim, who had been infected with their retrovirus. The Voyager crew was able to modify the shields to penetrate the grid at a weak spot, allowing them to beam Kim aboard. (VOY: "Favorite Son")
The multiphasic chamber built by the USS Equinox crew to contain nucleogenic lifeforms contained a polaron grid and a submolecular resequencer. These modifications allowed them to convert the lifeforms' remains into a crystalline energy source for their warp drive. (VOY: "Equinox")
