There are many good photos/illustrations at the article.
Serrated "sharktoothed" arrowhead or dart point.
The sharktooth-edged swordclubs: at Cahokia, the shaped flint "Sharkteeth" later fulled the purpose but shark's teeth was still also imported to set to the edges of the club-swords. The wooden handles with the embedded teeth have been found intact in "Moundbuilder" burials.