由于 (yóu yú)

due to; as a result of; thanks to; owing to; since; because

Character breakdown

由 (yóu) · 5 strokes

Depicts a kind of helmet worn by warriors. Based on the original meaning "helmet", now written as 胄. The current meaning is a phonetic loan.
于 (Yú) · 3 strokes

Pictograph of a musical wind instrument with a reed, which is now written as 竽. The current meaning is a phonetic loan.