The piano damper is one of the most important components of a piano's sound. It is responsible for controlling the sustain and resonance of the piano's strings. There are a few synonyms for the piano damper that you may come across in piano terminology, including the mute pedal, soft pedal, and una corda pedal. The mute pedal is used to reduce the volume of the piano and create a muffled sound by moving a strip of felt between the hammers and strings. The soft pedal is used to change the timbre of the piano by shifting the hammers slightly to hit fewer strings. Finally, the una corda pedal is used to shift the position of the hammers so that they hit only one string instead of two or three, creating a quieter and more delicate sound.