The symbol fp means
Responses
gradually get softer.
gradually get softer. - no response given
gradually get louder.
gradually get louder. - no response given
play soft then immediately loud.
play soft then immediately loud. - no response given
play loud then immediately soft.
play loud then immediately soft. - no response given
play loud then immediately soft.
This is known as a musical term called "fp" (forzando piano), which means to play a note or phrase loudly and then immediately soften the sound. It essentially indicates a sudden dynamic change from loud to soft.