The biggest math symbol

The Riemann P-symbol, or Papperitz symbol, is one of mathematics' largest notational constructs. Created by Erwin Papperitz for Riemann's differential equation, it represents an equation with three regular singular points at a, b, and c. The symbol's complexity ensures solutions transform simply under Möbius transformations, which are conformal automorphisms of the Riemann sphere. During these transformations, only singularity location parameters change, while others remain constant, showcasing the symbol's elegant design.