The note an octave lower than the fundamental tone (the low tone range), is called 'ryoon' (lower tone), the note an octave higher than the fundamental tone (the medium tone range) is called 'kanon' (medium tone), and the note an octave higher than kanon tone is called 'daikan' (high-pitched tone).
基本音からの一オクターブ（低音域）を「呂音（りょおん）」、そのオクターブ上（中音域）を「甲音（かんおん）」、更にオクターブ上の高音域を「大甲（だいかん）音」と呼ぶ。