Prior to starting my masters studies, I decided to vocally express my 'I don't knows' instead of trying to figure things solely on my own. I realized I drew this symbol (c) besides any difficult question or unclear statement; in order to ask someone later.
It wasn't until I indulged into semiotics, and knew that some symbols mimic a motion, that I realized it was the same motion followed to write the first letter of my name in Arabic "Ein" (a).
What was more interesting is that, although Arabic is written from right-to-left, I always tilted pages by 90 degrees and wrote from top-to-bottom. As shown in (b), the hand gesture I write "Ein" with is identical to that of the I DON'T KNOW symbol.
You can imagine the exestential reflections I had after this realization...