The word 眉毛 is formed by combining two pictographic characters that together create a direct visual and conceptual representation. The first character, 眉, is an ancient pictograph that originally depicted an eye (目) with exaggerated hairs above it, representing the eyebrow itself. The second character, 毛, simply means "hair" or "fur". Therefore, the compound visually specifies and clarifies the first character by explicitly attaching the notion of hair to the eyebrow, forming a complete idea: the "eyebrow hairs". It is a logical pairing where one element presents the core concept and the other describes its defining physical characteristic.