Noun
piano roll (plural piano rolls)
A perforated roll of paper containing encoded music to be played by a pianola or player piano.
He also worked with the Aeolian Company for its 'Autograph Metrostyle' piano roll series wherein he indicated the tempo mapping for many of his pieces. Source: Internet
The "staff" is most widely referred to as "piano roll", created by extending the black and white piano keys. Source: Internet