It's tough to say what "idea" means.<p>Take the "cap" from John Christopher's Tripods books. The aliens used it to keep adult humans docile. It is placed on them during puberty.<p>That is not in here as "cap".<p>But is it some other thing? Perhaps "Remote-Control Slavery Mental control (possibly mediated by radio waves) of individuals of other species."?<p>And it uses terms as synecdoche, like how 'Bergenholm Drive' is 'A device that renders a spaceship free of inertia', rather than the more general category of 'inertialess drives', which is also used in Warhammer 4k (<a href="https://warhammer40k.fandom.com/wiki/Inertialess_Drive" rel="nofollow">https://warhammer40k.fandom.com/wiki/Inertialess_Drive</a> ), Theodore Sturgeon's "Sturgeon" (<a href="https://archive.org/details/galaxymagazine-1956-08/page/n131/mode/2up?q=%22inertialess%22" rel="nofollow">https://archive.org/details/galaxymagazine-1956-08/page/n131...</a>), and others (<a href="https://dbpedia.org/page/Inertialess_drive" rel="nofollow">https://dbpedia.org/page/Inertialess_drive</a>).<p>Those interested in this list may like the Historical Dictionary of Science Fiction at <a href="https://sfdictionary.com/" rel="nofollow">https://sfdictionary.com/</a> and The Oxford Dictionary of Science Fiction (<a href="https://archive.org/details/bravenewwordsoxf00pruc/" rel="nofollow">https://archive.org/details/bravenewwordsoxf00pruc/</a>).