The words that refer to the dynamics record the intensity of the sound (for the case of the piano) or the sensation that a certain musical section may transmit. The most widely used to record intensity are:
Pianissimo: very low volume, very gentle touch.
Piano: low volume, gentle touch.
Forte: high volume, strong touch.
Fortissimo: very high volume, very strong touch.
Other symbols for musical dynamics
Just for curiosity, the word “dynamics” comes from the Greek dynamos, which means strength.
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