The provided source material does not contain information regarding a city named Yoni in Sierra Leone; instead, it describes yoni as a religious and spiritual symbol. In Hindu tradition, a yoni is an abstract or aniconic representation of the goddess Shakti. It is frequently depicted alongside its masculine counterpart, the linga.
Together, these symbols represent the union of the feminine and masculine, symbolizing the merging of microcosmos and macrocosmos as well as the eternal process of creation and regeneration. The yoni is conceptualized as nature's gateway for all births, particularly within Shaktism, Shaivism, and esoteric practices such as Kaula and Tantra.