A bell-shaped lamp shade with a waisted (narrowed) section in the middle is a classic and elegant design. This style of lamp shade is often referred to as a "bell-waisted" or "waisted bell" shade. The bell shape allows the light to be diffused and soft, while the waisted section adds a touch of sophistication and visual interest. This style of lamp shade is often used in traditional or vintage-inspired decor, and can be paired with a variety of lamp bases and styles to create a unique look.