What Is Solitreo?

Solitreo is a system of sephardic cursive writing used by Ladino speakers.  Pre-WWII, solitreo was commonly used for Ladino correspondence (when handwriting was appropriate) rather than printed materials (where Rashi was often used).  

In the below chart, which can be found at Ladino Chart, you can see an example of the Hebrew letters written in Solitreo.