Why is there an upside down capital M but not an upside down capital W?

The reason there is an upside-down capital M (which resembles a W) but not an upside-down capital W (which does not resemble an M) is due to their symmetrical properties. When flipped vertically, the shape of the M aligns with that of a W, while a W does not have a corresponding shape that resembles an M when flipped. This distinction arises from the specific angles and curves of the letters, making the M the only letter that visually inverts to match another in this way.