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Klingon cloaking device

A clocking device from the mirror universe in 2375

A cloaking device is a form of stealth technology that uses 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.

In 2155, the ISS Enterprise had acquired a Suliban cloaking device and used it to enter Tholian space. (ENT: "In a Mirror, Darkly")

In 2371, the Klingon-Cardassian Alliance had cloaking technology. They used the cloak to capture Miles O'Brien and the mirror universe version of Benjamin Sisko. (DS9: "Through the Looking Glass")

By 2375, the technology was unknown in our universe. Regent Worf arranged to have one acquired from the mirror universe. (DS9: "The Emperor's New Cloak")