The "nga'bulo" bracelet is a non-sacrificing altar bracelet. Translated by "altar of the formative ancestor".

It is the metal bracelet offered from an early age to the Gourmantché man as a symbol of the ancestor whom the diviner will have identified as his guardian. Despite its assimilation to altars (as shown by its name), "it is inconceivable, for the Gourmantché, that sacrificial offerings can be made on a nga'bulo".

The Gourmantché diviners question the spirits by drawing points on the sand, small circles, connected together in a certain way, to enter into a relationship with the god Ountérou,
each sign representing a human, animal or material symbol.

On bracelets, the intertwining of lines joining dots, small circles, or very sharp triangles, certainly have a meaning related to the symbolism of divination figures.

It is cut from a bronze sheet, chiselled with a small chisel and shaped.

If we look closely, we realize that the points were made first and that they were then linked together, which explains why some are less visible or half visible because some of them have been erased by the lines that join them.