The noun 钢琴 (gāngqín) means "piano" and literally translates to "steel instrument." It is the standard Chinese word for the piano and is used when discussing musical instruments, performances, or music education.
我女儿五岁就开始学钢琴了。
wǒ nǚ'ér wǔ suì jiù kāishǐ xué gāngqín le.
My daughter started learning piano at the age of five.
客厅里摆着一架黑色的钢琴。
kètīng lǐ bǎi zhe yí jià hēisè de gāngqín.
There is a black piano in the living room.
他每天练钢琴至少两个小时。
tā měitiān liàn gāngqín zhìshǎo liǎng gè xiǎoshí.
He practices piano for at least two hours every day.