What is a bunt cake pan?

There is no such thing as a "bunt cake pan". It's likely you're thinking of a Bundt pan.

A Bundt pan is a distinctive cake pan characterized by its unique, fluted, ring-shaped design. This design creates a cake with a beautiful, intricate swirl pattern and a hollow center.

Bundt pans come in various sizes, but the most common is 10 inches in diameter. They are made from various materials like aluminum, nonstick, or silicone.

If you're referring to a different type of pan, please provide more details about its shape or features, and I'll gladly help you identify it.