Trefoil, comes from Lantin, means three-leaved plant. It is a shape used in architecture and Christian symbolism. For more details about this shape checkout this Wikipedia article.
Hint: This shape is composed of three arcs with extent of 240 degrees.
The following red cross with Python and Turtle. You need to fill it with a color. Source Code:
You can generate the look of an oval shape with 4 circle arcs. Draw the first arc with larger radius and extent 90; draw the second arc with smaller radius
