SIGINT

noun3

1. •
   A signal sent to a process by its controlling terminal when a user wishes to interrupt the process.
2. •
   Abbreviation of signals intelligence.

   • (a) Intelligence.—This includes SIGINT, ELINT and their Electronic countermeasures (ECM, ECCM, ECCCM and so on). — 2002
3. •
   An Earth-orbiting satellite used to intercept signals.