拗音 ようおん
yo uon

Noun

1. contracted sound; palatalised sound (e.g. Japanese morae with small kana); palatalized sound

Linguistics
拗音 ようおん(ゃ ゅ ょ)と促音 そくおん(っ)の かた、加 くわえていただけると参考 さんこうになるかもしれません。
yōon'(ya yu yo)to sokuon'(n)no dashikatamo kuwaete itadakeruto sankōni narukamo shiremasen.
I think it might be useful if you could add how to output the diphthongs (with small ya/yu/yo) and geminate consonants (with small tsu).