What does the star mean in sheet music?
In musical notation the sign. ( U+1D1AF 𝆯 MUSICAL SYMBOL PEDAL UP MARK) indicates when the sustain pedal of the piano should be lifted. In liturgical music, an asterisk is often used to denote a deliberate pause.
What is the meaning of star in piano notes?
It indicates that the notes can or should be played with either the left or right hand. These indications are usually suggestions from the composer or editor and does not necessarily need to be followed. As for the "stars", it may very well be pedal markings, which usually means to lift the damper pedal.