DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   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)