Steel designations are so darn confusing

[cantgetaname]

I've been trying to understand the major systems for hours. All are ridiculously complicated and seem to make no sense. Wikipedia articles are poorly written and google is having a hard time digging something useful.

If any of you guys have any links that do a good job of explaining any system (ISO,SAE,EN,DIN) please dump it here.

 

[Travis_King]

What about them are you trying to understand?