Common Lisp's convention w.r.t predicate names appears to be all about the p or -p suffixes. My question is: Did older lisps use the '?' convention before CL, or was Scheme the first to conventionalise the use of ? in predicates?

Sorry for the off-topic question, I couldn't find any definitive answers online, and figured there's bound to be someone here that lived through the development.

Thanks,
Charlie.
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