What shape is the nest of umbrella wasps commonly described as?

The nest of umbrella wasps is commonly described as umbrella-shaped due to its distinctive wide, flat structure that resembles an inverted umbrella. This unique shape effectively provides shelter for the wasps, offering them protection from predators and adverse weather conditions. The nest's form is designed to be open, allowing for easy access and ventilation while still being protective. This makes the umbrella shape not only a visual characteristic but also a functional design that benefits the wasp colony. Other shapes like flat, coiled, or shovel do not accurately describe the specific and functional characteristics of these nests.