The damson plum is a small, tart fruit that is often used in cooking and baking. However, there are several other names for this fruit that you may not be aware of. The damson plum is also known as the Damascene plum and the Prunus insititia. In some regions, it is simply referred to as the prune plum, though this can cause confusion with the dried fruit of the same name. Regardless of what you call it, the damson plum is a versatile ingredient that can be used in a variety of sweet and savory dishes.