U+0041 LATIN CAPITAL LETTER A) and ‘🛅’ (
U+1F6C5 LEFT LUGGAGE) for the short URL, which seems to be an okayish compromise between having many characters and having some hope of being supported by a modern font.
U+1F6C5is 64531, according to GHC 7.10.3:
λ> (length . filter isPrint) [chr 0x41 .. chr 0x1F6C5] 61229