"Rungu" is a type of weapon that people sometimes use. It's like a stick, but it's thicker and heavier. You can hold it in your hand and use it to protect yourself if someone tries to hurt you.
The rungu is usually made of wood or ivory and is about the size of your arm. It has a round, chunky head which can be smooth or have knobs sticking out of it.
People in some parts of Africa used the rungu as a weapon for hunting and warfare a long time ago. They would hit animals or enemies with it to protect themselves or get food. Nowadays, some people still use it as a symbol of power or as a decoration.
But, it's important to remember that hurting others is not a good thing to do. Always use the rungu, or any other weapon, safely and responsibly.