This is a tikz question. Its a long code so I am adding the line that needs help
\draw[black,thick,fill=white] ($(c2i.north west)+(-0.0,0.0)$) rectangle ($(c3i.south east)+(0.0,-0.0)$);
This is a rectangle. Now I want to place a curly arrow in its middle. I saw
Mutual coupling and Circuitikz?
How to put a symbol inside a circle arrow?
and tried
\draw[black,thick,fill=white] ($(c2i.north west)+(-0.0,0.0)$) rectangle ($(c3i.south east)+(0.0,-0.0)$) {$\circlearrowleft$};
but this isn't working. Can someone help here. I have included required packages but I think its a syntax problem
\node[draw] {$\circlearrowleft$}. Optionally usinginner septo change the size of the rectangle. – Roald Sep 09 '16 at 16:14