Star of David
In Hebrew it is called the Shield of David.
This one is built of 2 triangles of equal sides that can be drawn using 2 polygon. There is some basic math behind the triangles to calculate the height of the triangle. Some more math to place the two triangles on top of each other.
I've added a rectangle around it to make it stand out.
<svg width="220" height="249" xmlns="http://www.w3.org/2000/svg">
<rect width="100%" height="100%" fill="white" stroke="black" stroke-width="1" />
<polygon points="
10,66
210,66
110,239
"
fill="none"
stroke="#0038b8"
stroke-width="10"
/>
<polygon points="
10,183
210,183
110,10
"
fill="none"
stroke="#0038b8"
stroke-width="10"
/>
</svg>
