Examples of Cultural Similarities between those in the Nile Valley and those in other areas of Africa

The goal here is to highlight cultural parallelism or similarities between Dynastic Egypt and elsewhere in Africa from various sources; mind you, not to argue for or against cultural diffusion between communities in the said regions. Let's start this compilation of cultural parallels between ancient Egypt and other parts of Africa with the "Rainmaker King", neatly described in the following 2004