A list of all the Unicode characters.
It's essentially just this, but paginated:
<?php foreach (range(1, 200000) as $i): ?><li>&#<?php print $i; ?>;</li><?php endforeach; ?>It would have been good to use @font-face and its unicode-range attribute, to specify different fonts for different ranges of Unicode characters, but there don't seem to be many Unicode fonts available for linking and Firefox doesn't support unicode-range yet.