手臂
shǒubì · HSK 7
arm
💪 手臂 = 手 (hand) + 臂 (upper arm): the limb running from hand to shoulder
手 means hand and 臂 means the upper-arm/limb; together 手臂 covers the whole arm. The 月 radical on the left of 臂 is the flesh/body radical, marking it as a body part.
手 — pictograph of a hand with five fingers
手 is a pictograph showing an open hand with fingers and a wrist. Early bronze and oracle bone forms clearly depict five splayed fingers, which simplified over time into the modern shape. It keeps its original meaning of 'hand' and also serves as a radical in many characters related to hand actions.