As names, car and cdr are great: short, and just the right visual distance apart. The only argument against them is that they're not mnemonic. But this is a weak argument.
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Why did you go with “pair” instead of “cons” in bel?
Because cons is not the primitive that makes them. That's join. It would have been weird for join to make things with the name of a function built on top of it. So I could use cons for the name of the function or the name of the type, but not both, and I chose the former.