A Ngulu is an execution sword used by the Bantu peoples (including the Ngombe, Doko, Ngala, etc.) of the Congo Basin. It resembles the Khopesh, the sickle-sword of ancient Egypt, except that it has a much more massive blade, made of iron, with a non-cutting back and a semi-circular concavity. The handle, often surrounded by metal wire, ended with two large wooden buttons and a smaller one. It could be one or two blades and was used for capital executions by beheading (the condemned was kept seated, head extended and attached to a branch).
en:The Noun Project
Alessio Capponi