What is the name of the material that stacks around the edge of an impact crater on the moon?

The material that stacks around the edge of an impact crater on the Moon is called "crater rim ejecta" or simply "ejecta." This material is composed of debris that is ejected outward during the impact event and can form a raised rim around the crater. The thickness and extent of this ejecta can vary depending on the size of the impact and the characteristics of the lunar surface.