On the Touhou Clock thingy, there are some short animations where you can play Rock-Paper-Scissors with a character (often Reimu or Marisa); they use a sign much like that one to show what they cast (and it really does change even though the animations look the same).
So Sanae here has just gone and applied her [lack of] common sense to Rock-Paper-Scissors.
Sanae: IT"S ABOUT HOW MICKEY MOUSE'S HAND IS A DOWSING ROD< HAHAHAHHAAHAAHHAHA!!! THAT LITTLE PIPSQUEAK FROM THE MYOUREN TEMPLE IS PROOF< SO I MADE THIS!!! QUITE ACCURATE< SO WITH THIS< ONE MORE TRUTH TO UNDO THE POPE IS NOW IN MY OBSESSION, WHOOPS< TYPO>>> POSSESSIONONONONON, HAHAHAHHAHAHHAHAHAA!!!