<path
d="
M 100,100
L 100,300
L 150,300
L 150,150
S 250,150,175,200
L 200,300
L 250,300
L 225,225
S 350,100,100,100"
stroke-width="1"
stroke="#003366"
fill="#cccccc"
></path>
Explanation
(M)ove to (100,100)
(L)ine to (100,300)
(L)ine to (150,300)
(L)ine to (150,150)
(S)mooth Bézier curve through control point (250, 150) to (150,175)
and so on ...