In the orchestra, piano is percussion. Persussion is any instrument that produces sound by striking, and in a piano, a little hammer strikes the strings. Stringed instruments (violin, viola, cello, bass) are sometimes considered percussion when the strings are being plucked. So yes, piano is considered a percussion instrument.
Piano IS considered a percussion instrument. It is also considered a stringed instrument because the sound is produced with a string that vibrates. If this were a question on a school test or something, the best answer is that it is a percussion instrument (regardless of whether it is in a band or an orchestra or used as a solo instrument or in chamber music).
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