Note that these names refer to angles, not target. A Tondo is still a Tondo if you aim for the head instead of the waist.
Though originally printed vertically, the Falso Dritto probably doesn’t refer to a vertical cut, but rather a diagonal somewhere between the red and lower green lines.
The numbers are the 8 primary cutting lines used in sabre. Many clubs use them as a universal shorthand for describing cuts, as it is much faster to say “Cut 1” than “Cut a Dritto Squalembrato”.
Later diagrams such as Fabris have cut 8 listed as both “Montante” and “Sotto Mano”. Some such as Capoferro say the montane is a true edge cut, which implies that Sotto Mano is the false edge cut.
Likewise cuts 3 & 4 have a second name in latter texts. In dall’Agocchie, it is called a Ridoppio when used as a true edge cut.
Source Image: https://wiktenauer.com/wiki/Achille_Marozzo#/media/File:Marozzo_26.png