> In a perfect world, we would probably have an enclosing symbol (e.g.
> '\<4E00>') so that the number can be variable length.
<tuning into another language channel>
In Perl the notation is \x{...}, where ... is hexdigit sequence:
\x{41} is LATIN CAPITAL LETTER A while \x{263a} is WHITE SMILING FACE,
and \x{1D400} is MATHEMATICAL BOLD CAPITAL A.
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