A colloquialism used to describe individuals working for unknown organizations or the government who are tasked with protecting secrets or performing other strange activities; especially common in ufology; also used to denote entities of a more supernatural nature.

From the Ra Contact: A thought-form type of entity used by the Orion group; although they have certain physical characteristics given them, their true vibrational nature is without third-density vibrational characteristics and, therefore, they are able to materialize and dematerialize when necessary.