Equilateral triangles are a fundamental shape in geometry that feature three equal sides and angles. While the term "equilateral triangle" is the most widely used, there are a few other synonyms that can be applied to this shape. One such synonym is "regular triangle," as in regular polygons, which have equal sides and angles. Another synonym is "equiangular triangle," which emphasizes the equal angles of the triangle. Finally, some may use the term "isoceles equilateral," although this is a bit of a contradiction as an isosceles triangle only has two equal sides. Overall, while "equilateral triangle" is the most commonly used term, there are a few other words that can be used to describe this fundamental geometric shape.