I’ve come across Refal[1], who’s creator Valentin Turchin seems like someone who hasn’t gotten the recognition he maybe deserves. As an aside, his son Peter Turchin does some interesting work in a different direction that’s def topical these days.
I know SNOBOL gets labeled as one.
Would Prolog count? I haven’t actually written any myself. They def make a strong appearance in Erlang, though it isn’t the first thing that comes to mind if describing. There’s XSLT of course.
Any others?
I think if one were only able to pick one metaphor for a language, I think a strong case could be made for:
pattern => behavior