Furigana is the name for the phonetic characters placed above kanji (Chinese characters) to tell the reader the pronunciation.
Furigana are the phonetic symbols sometimes written above difficult or rare kanji to show their pronunciation
「ふりがな」=Furigana is the name for the phonetic characters placed above kanji (Chinese characters) to tell the reader the pronunciation. / Furigana are the phonetic symbols sometimes written above difficult or rare kanji to show their pronunciation
「ruby」は少しマニアックな言い方なのでその単語だけで説明しようとするとそうとう知識がある人ではないと通じない気がします。ふりがなをもっと細かく説明した方が良いと思います。