Origin

This character combines the bamboo radical at the top, which marks it as something made from bamboo, with the component 由 at the bottom, which serves as a sound hint for the pronunciation. Since flutes, whistles, and pipes were traditionally made from bamboo in East Asia, the bamboo classifier makes sense. The 由 component doesn't add meaning but rather guides how the character should be pronounced, following a common pattern in Chinese character formation where one part indicates meaning and another hints at sound.