pseudotriangle
...that a nonconvex polygon with three convex vertices is called a pseudotriangle?
...that a nonconvex <a href="./Polygon" id="mwCAI" rel="mw:WikiLink" title="Polygon">polygon</a> with three <a href="./Convex_set" id="mwCAM" rel="mw:WikiLink" title="Convex set">convex</a> vertices is called a <b id="mwCAQ"><a href="./Pseudotriangle" id="mwCAU" rel="mw:WikiLink" title="Pseudotriangle">pseudotriangle</a></b>?