倚音 is read as いおん (ion) and means appoggiatura.
いおん
ion
こうおん
high-pitched tone
ぼいん
vowel
ほんね
real intention
ろくおん
(audio) recording
そうおん
noise
おと
Chinese-derived character reading
おん
ね
ぼうおん
soundproofing
いくどうおん
(saying) with one voice
はつおん
production of sound
あしおと
sense or sign that something is approaching