also: ピアニシモ
noun
pianissimo
A musical dynamic marking meaning 'very soft'. Used as a noun in Japanese to refer to the marking itself or a passage played very softly.
from Italian
この部分はピアニッシモで演奏してください。
Please play this part pianissimo.
楽譜にピアニッシモの指
There is a pianissimo marking in the score.