Amongst the countless animal bones collected at Ishango, there were some with notches.
Notches are often considered as count marks, with a line being equivalent to
something. The marks however do not imply the invention of counting.
In fact, it is not very clear: there are two bones marked very clearly with notches and these could have been used for counting. Then there are a number of other objects with notches, such as harpoons, which could have been for something else.