Official definition of the United States Department of the term foreign instrumentation signals intelligence .
foreign instrumentation signals intelligence
Technical information and intelligence derived from the intercept of foreign electromagnetic emissions associated with the testing and operational deployment of non-US aerospace, surface, and subsurface systems. Foreign instrumentation signals intelligence is a subcategory of signals intelligence. Foreign instrumentation signals include but are not limited to telemetry, beaconry, electronic interrogators, and video data links. Also called FISINT. See also signals intelligence. (JP 2-01) (US DoD)