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Reference.org
Non-communications signals
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<p>In <a href="/facts/SIGINT/Iwzvw6AW">signals intelligence (SIGINT)</a>, non-communications signals are any signals sent out for a purpose other than communicating information. This includes <a href="/facts/Radar/jk9BTbFA">radar</a> emissions and emissions from <a href="/facts/Instrumentation/znu7yF5t">instrumentation</a> (which provide information, but are not sent out for the purpose of providing information to others). </p><p><a href="/facts/ELINT/Iwzvw6AW">Electronic signals intelligence (ELINT)</a>, which came to be studied in great detail after <a href="/facts/World_War_II/2efV5L1U">World War II</a>, attempts to detect and analyze enemy non-communications signals. <a href="/facts/Foreign_instrumentation_signals_intelligence/5JR0xlSz">Foreign instrumentation signals intelligence</a> (FISINT) focuses specifically on non-communications signals emitted by instrumentation, including <a href="/facts/Telemetry/Mz9czXTl">telemetry</a> signals sent between components of a system. </p>