Cloaking device is a technology for partial or full invisibility to parts of the electromagnetic spectrum.
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Cap of invisibility (aidos kyneê in Greek) is a mysterious helmet or cap that possesses the ability to turn the wearer invisible.
A prototype Metascreen is a claimed invisibility cloak, which is just few micrometers thick and to a limited extent can hide 3D objects from microwaves in their natural environment, in their natural positions, in all directions, and from all of the observer's positions.