First time I heard this word/phrase was from a Canadian country singer.
And it probably isn't what you'd expect.
This man is beautiful. And a wonderful historian and storyteller through song.
Album version: https://www.youtube.com/watch?v=QPgXYhjKXw8
Live: with a little preambke https://www.youtube.com/watch?v=jb4Kjq_MmR8
(I have no connection to him in any way, I don't like country, but I love this man and his music.)





With a just a few just large enough neodymium magnets.
No signal, no movement, no data.