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It made more sense at the time. 411 is an actual directory service (similar to dialing 0 for the operator). [1]

N11 codes are a particular curiosity of the electromechanical switching systems used to set up circuits: https://en.m.wikipedia.org/wiki/N11_code

What's the haps? What's the skinney? What's the 411?

3 questions that Gen-Zers probably have never heard asked and will never ask themselves