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Are there any differences between what in Common Lisp you’d call an atom, and a symbol?
Do these differences extend to other languages in the Lisp family?
(I’m aware that atom has a different meaning in Clojure, but I’m interested in the boundaries of what is a symbol.)
In Common Lisp, atom is precisely defined as any object that is not a cons. See http://l1sp.org/cl/atom for more details.
I don’t know about other languages in the Lisp family.