Cloaking device

A cloaking device, also known as a cloaking system, cloaking shield or invisibility screen in Star Trek, was a form of stealth technology that used selective bending of light (and other forms of energy) to render a starship or other object completely invisible to the electromagnetic spectrum and most sensors. It was encountered in varying forms over the centuries. The Federation often encountered Klingons and Romulans with the technology, until they adopted its use from around 2370.