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There was actually a pre processor that used the characters ᐸ and ᐳ as part of faked generics.

I'm pretty sure that was the joke.

I assumed it was APL at first.

That or BQN! I know APL enough to know it wasn't, but still, funny how quickly my mind tried to identify it.

That was my first thought as well. Only saw a language with those inverted triangle.

You can stick to ASCII if you wish.