I’ve seen it used, although we normally used two full circles with center blobs instead, and we’d call it a “chick check”. It makes for a nice break and forces the mostly male FRBs (Front Running Bastards) to wait up. Plus, it’s a delicious hash crime if a male hasher accidentally checks on a chick check.
Don’t you just hate it when logistical constraints preclude your favorite refreshment?
Further, I demand to see the sign for the dick check. I have no intention of sitting through another chalk talk without seeing it up close and personal. After all, I don’t want to go where I’m not wanted.