FISINT stands for Foreign Instrumentation Signals INTelligence from the intercept of foreign electromagnetic emissions associated with the testing and operational deployment of non-US aerospace, surface, and subsurface systems." Since it deals with signals that are not exchanged by humans, it is a subset of ELINT, which, in turn, is a subset of SIGINT

SIGINT

Signals intelligence is intelligence-gathering by interception of signals, whether between people , whether involving electronic signals not directly used in communication , or combinations of the two...

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Typical examples of such communication include:

• Telemetry data (TELINT). Missiles, satellites, and other remotely-monitored devices often transmit streams of data concerning their location, speed, engine status and other metrics.

• Video data links. These may be present in UAVs
  Unmanned aerial vehicle
  An unmanned aerial vehicle , also known as a unmanned aircraft system , remotely piloted aircraft or unmanned aircraft, is a machine which functions either by the remote control of a navigator or pilot or autonomously, that is, as a self-directing entity...
  
   or from satellites used for reconnaissance.

See also

• ELINT: Electronic intelligence
• HUMINT
  HUMINT
  HUMINT, a syllabic abbreviation of the words HUMan INTelligence, refers to intelligence gathering by means of interpersonal contact, as opposed to the more technical intelligence gathering disciplines such as SIGINT, IMINT and MASINT...
  
  : Human intelligence
• COMINT: Communications intelligence
• SIGINT
  SIGINT
  Signals intelligence is intelligence-gathering by interception of signals, whether between people , whether involving electronic signals not directly used in communication , or combinations of the two...
  
  : Signals intelligence
• IMINT
  IMINT
  Imagery Intelligence , is an intelligence gathering discipline which collects information via satellite and aerial photography. As a means of collecting intelligence, IMINT is a subset of intelligence collection management, which, in turn, is a subset of intelligence cycle management...
  
  : Imagery intelligence
• Missile guidance
  Missile guidance
  Missile guidance refers to a variety of methods of guiding a missile or a guided bomb to its intended target. The missile's target accuracy is a critical factor for its effectiveness...
  
  
• Intelligence collection management
  Intelligence collection management
  Intelligence Collection Management is the process of managing and organizing the collection of intelligence information from various sources. The collection department of an intelligence organization may attempt basic validation of that which it collects, but is not intended to analyze its...