Tughra and Crop Circle Symbols for Bidirectional Flow

A famous crop circle (images A and B), compared with a famous Tughra (images C, D and E). Image C has something really cool near letter C. You might need to click to zoom in to see it. There's an animal head with it's neck making a "looking back" pose, which is a side-loop loop-back of horizontal plane flow. This means bidirectional flow.

Furthermore, all these tughras have 2 lines in this position, so I think we can infer that those 2 lines have flow in opposite directions, one going inward, one going outward. Image E has a lot of tiny outflow markers on one of those two lines, the upper line. Overall, these are still hard to understand, finding hints is always fun.