I’m sure someone told me when I was quite young that it was just Welsh that had /?/. Then I read about Zulu. Then I discovered that Icelandic has a word-final /?/. Today I see that Liangshan Yi, which takes up a good chunk of the Unicode spec, has it as well.
The characters are pretty remarkable. They look as if they could be used as graphics, like the Unicode snowman.
The ? itself looks like a stripped-down Amnesty International candle.
How does this look in your browser?