A device or person that blocks or interferes with something, like radio signals or machinery.
From the verb 'jam' (to get stuck or to force something in tightly), combined with the agent suffix '-er.' The term appeared in the late 1800s and expanded during wartime when military jamming technology became important.
During WWII, both sides developed 'radar jammers' to confuse enemy detection systems—it created an ongoing arms race where technology to jam signals kept getting more sophisticated, just like hackers and cybersecurity today!
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