Frame:
a rigid metal structure that supports the piano's strings.
Strings:
several sets of metal strings stretched across the piano's frame and tuned to different pitches.
Soundboard:
a large piece of wood that amplifies the sound of the strings.
Bridge:
a wooden structure that holds the strings and transfers their vibrations to the soundboard.
Keybed:
the set of keys that the pianist presses to play the piano.
Key action:
the mechanism that connects the keys to the hammers and strings.
Hammers:
small hammers that strike the strings when the keys are pressed.
Pedals:
levers that the pianist can depress with their feet to change the tone or sustain of the sound.