Hello. :)

Del Rey translates the kanji as 'eternal' and 'tower', but when I looked them up in the dictionary I got:
玖 【きゅう】 (n) nine (used in legal documents);
楼 【ろう】 (n) tower; turret; lookout; belvedere;

So I don't know. And, um, it's my pet theory that Yue was Clow's High Priest...