脳
のう · nou · JLPT N3 · noun
brain
🧠 Sounds like know: your のう is what lets you know things
Left side 月 is the flesh radical used for body parts (腕, 脚, 胸). The right side began as hair (ツ) above 囟, the soft spot on top of a baby's skull. So 脳 means the body part under the skull: the brain.