I doodled this on my high school notebooks too, in the mid-1970’s. They went along with an early interest in infinity symbols, the snake eating its own tail, M.C. Escher and Mobius strips. I’m still a sucker for a story, a song, or a hiking trail that ends where it begins, but with a twist along the way.
I also recall that S/8 shape, like in Steve Maher’s wonderful illo, above, in some sort of military or organizational patch I saw as a child- but sideways; a “lazy 8”- in gold braid. My dad was in the US Army Corps of Engineers, so it might have been on one of his uniforms or hats.