No, I'd never heard of a concatenative language before, either. But I've used one (Forth) without knowing it. I used Forth many moons ago, and though I haven't touched it for at least 25 years, I remember it as being fun, unexpectedly powerful (considering the alternative was assembly language), amazingly portable (there were Forth interpreters on every microcomputer I was working with back then, something like a dozen different instruction sets).
I just ran into a little blurb on Factor, a much more modern concatenative language. I haven't used it, just read about it a bit. It's stack-oriented, much like Forth is (yes, Forth is still around!). But it's got all sorts of interesting features that Forth doesn't...
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