These figures could be the universal pictoral symbols for numbers. I especially like the triangle figures since the triangle is the 2D simplex. https://domoder

These figures could be the universal pictoral symbols for numbers. I especially like the triangle figures since the triangle is the 2D simplex. https://domodernlife.files.wordpress.com/2014/07/nodal-lines.jpg https://domodernlife.files.wordpress.com/2014/07/nodal-lines...