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That's a throwback from the 70s - namely, the movie Convoy, where the protagonist - played by Kris Kristopherson - was a trucker known by the CB handle of "Rubber Duck". 10-4 is an acknowledgement code.. it just means that you've received and are acknowledging whatever was said over the CB.

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10y ago

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Q: Why do trucker's use the call sign '10-4 rubber ducky'?
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