Origin

This character combines the wood radical on the left, which signals that the thing being described is made of or relates to wood, with a sound component on the right that provides a pronunciation hint. The wood radical makes sense because many early machines and contraptions—gears, levers, restraining devices—were constructed from wood. Over time, the character broadened to mean any kind of machine or mechanical instrument, not just wooden ones, though the wood radical remained as a historical trace. The right component doesn't add meaning; it simply hints at how the character should be pronounced.