Integral

My very favorite collar shape is a spread collar with a bit of an s-curve to it.  Not all shirts will do it properly, and not at every stage of their life cycle.  Here, on a Charles Tyrwhitt shirt.  On my right shoulder, from the front, it looks like the calculus symbol for taking an integral.  The pocket for the collar stay still leaves about 3/8" for the tip to bend.

There are way too many cheap opportunities to pun or riff on the word "integral" here, so instead, I'll name-check the Heisenberg principle and go to bed early before I make any such mistakes.

Or is that too derivative?