Maybe some of You plays on various musical instruments. Ofcourse, piano, guitar and such instruments are very known. Some instruments are known only for some nation, for example Fujara in Slovakia, Sitar in India, Erhu in China, ETC.
But there are also various unique an maybe rare musical instruments. I sometimes collect those musical instruments. For me unique is Venova from Yamaha, or Steel tongue drum (tank drum) too.
But, which musical instrument is unique for You? I don't think on musical instruments, such as piano, violin, saxophone, or guitar.