Homonym: jammer (Blocker)
A "jammer" is a device designed to disrupt or block communication signals, such as those used in mobile phones, Wi-Fi networks, or GPS systems. By emitting radio frequency signals on the same frequency as the targeted communication, jammers create interference that prevents devices from receiving or transmitting information effectively.
Jammers are often used in various settings, including military operations, to prevent unauthorized communication. However, their use is heavily regulated in many countries due to potential misuse and the impact on emergency services. In some cases, jammers can interfere with legitimate communications, leading to legal consequences for their operators.