ecm

/ˌiː siː ˈɛm/
noun
  1. Electronic countermeasures: systems or devices used in military or security contexts to disrupt or deceive enemy electronics, such as radar or communications.
    • The navy deployed ECM to protect the fleet from guided missiles.
    • The aircraft was equipped with advanced ECM to jam enemy radar signals.
    • ECM technology is constantly evolving to counter new threats.