↩ 🔵 🔵 🔵 ❪✺₄❫ Polarimetric Sets ○ ❪✺_❫ Polarimetric Subs ○ ❪✺_ₛₛ❫ Electromagnetic Subsets ○ ❪✺_ₜₛ❫ Polarimetric Typesets ○