The Lebombo bone is the oldest known mathematical artifact. It dates from 
BC and consists of 29 distinct notches that were deliberately
cut into a baboon's fibula. It was discovered within a cave in the Lebombo mountains
of Swaziland.
Lebombo Bone
See also
Ishango BoneThis entry contributed by Ed Pegg, Jr. (author's link)
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Cite this as:
Weisstein, Eric W., with contributions by Ed Pegg, Jr.. "Lebombo Bone." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/LebomboBone.html