That's an interesting site, Ruskie!
In my ignorance, I thought Pitman was the first shorthand
Re your question of making head / tail of those symbols, if you look at the top of the set you will see the alphabet and most of them have approx. 26 symbols, so I'd say they are the roman alphabet letters shown in those various shorthand systems.
My shorthand is not shown on that list, but it has many similarities with Pitman, and I can recognise some of the Pitman letter symbols.
Dawn M