The word 脂肪 (zhīfáng) is formed through a conceptual and visual synthesis of two characters, each built around the "flesh" or "body" radical (月). The first character, 脂, combines this radical with the component 旨, which carries an associated meaning of "delicious" or "rich essence", pointing to the oily, rich quality of fat. The second character, 肪, pairs the same flesh radical with 方, which can imply something square, solid, or substantial, suggesting the solid, stored form of this substance. Together, they create a compound that visually and notionally represents the concept of "fat" or "lipid" as a rich, substantive material within the body.