TS, SI, FVEY: what the Pentagon leak initials tell us about modern spying

Everything from the gamer leaker to the global spread of potential sources reveals much about the anxiety-making conditions of 21st-century espionage After TS (top secret), two other letters repeatedly stand out throughout the leaked Pentagon files: SI. The letters stand for special intelligence, and signify that the information has been derived from signals intelligence work. This encompasses eavesdropping, surveillance and even backdoor access to information systems - all part of a panopticon ...