rubi

from The Free On-line Dictionary of Computing (8 July 2008)

furigana
rubi

   <human language, Japanese> (Or "rubi") Small {hiragana},
   written above {kanji} (and these days sometimes above Latin
   characters) as a phonetic comment and reading aid.  The
   singular and plural are both "furigana".

   (2000-12-30)