[Ontonator]

Not relevant to C, of course, but Ruby supports something like this with `?a` being equivalent to `"a"` (both of which are strings, since Ruby doesn’t distinguish strings from characters). From what I’ve seen, it is recommended against in most styles, I assume because it is harder to read for most people.

[djur]

In older days before Ruby had encoding-aware strings, ?a would return the ASCII integer value of 'a'. It made sense in that context but is now pretty much a quirky fossil.