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I have had this conversation multiple times, about multiple cable types, while in electronics sales.
What’s the best analogy or wording you’ve found for conveying the nature of the problem to people?
It prevents you from connecting two live wires and dying.
I’m not sure there is one, I usually just highlight that they’re one-directional, and you would technically need another nontrivial piece of hardware in the middle.
Then we figured out what their problem actually was.