Giving Names to Symbols is Harmful to Understanding
The loop of [what]. It's an example where naming something will inhibit decoding it. So set aside "loop of Isis", "loop of life", etc.
Most loops shown in this post are horizontal plane outflows, that turn back and flow inward.
Image B's "coronal loop" has this physics, they are always in the horizontal plane region of the suns magnetosphere. When erupting above the equator, the outflow is low and it returns as an inflow at a little higher latitude. You will see this repeated in symbolism, so you can guess about flow directions of image C. Now forget the literal sun and apply this to every size of torus.
Hands and elbows and waistbands are all referring to the horizontal plane of the body-torus, but on image D, that loop is probably referring to the horizontal plane of the head-torus.
Image I might be called a literal object like a bowl, but it is also a half-sphere portal symbol, and the loop is probably simply serving as an extra marker about the horizontal plane being the transition from our-reality to a higher-density dimension.
Image J's bunched up fabric is forming loops, and the rings that hold those loops are the portal symbols. There is also zigzag cloth flowing downward, after outflow from that horizontal plane.
I used to consider these loops as being outflows going up, which is still somewhat true, but I now think of them also as bonus markers to tell these observer where the horizontal plane is on the pictogram. It's simpler than remembering "Isis" or pondering "life".
Symbolism has a lot of loops, vertical "loop backs" https://ca.pinterest.com/stevenbhalls/loop-back/ and horizontal plane "side loops" that can return to the same level or quite often go up or down to the next torus in a sequence. https://ca.pinterest.com/stevenbhalls/side-loop/
The infinity symbol is definitely a portal marker symbol, and it's loops go horizontally, vertically or sometimes diagonally. https://ca.pinterest.com/stevenbhalls/infinity/. The infinity loops could be a reminder about the loop nature of many flows that go out of portals and then find a way back into the torus.