> There are some pretty clear patterns to the character ordering, though -- if you look closely, you can see big runs of characters which share radicals. That'

> There are some pretty clear patterns to the character ordering, though -- if you look closely, you can see big runs of characters which share radicals. That's because those runs were allocated at once (e.g. CJK Unified Ideographs Extension G spanning from U+30000 to U+3134A) and they were systematically ordered by radicals and stroke counts. Note that radicals and stroke counts are fairly arbitrary and can differ among character sources (the Unihan database has a ton of them). While fairly predictable, this ordering is ultimately arbitrary.