- You may also be looking for the article on molecular phase inverters.
A phase inverter is a piece of technology which is used by for various purposes.
The Idanians use phase inverters in their dataports, making the information on the device much more difficult to be decoded. (DS9: "A Simple Investigation")
On the USS Enterprise-D, three phase inverters were used in its transporter system's resonator array. (TNG: "Relics")