That's the basics, of course. And then we have stuff like 4-5-1 flat and 4-5-1V. 4-5-1 flat is just flat, easy to understand, I hope. Players symmetrically placed in the D, M and ST rows. 4-5-1V would have the midfield arranged in a V shape, DMC, MC, MC, AML, AMR. This is how football formations are referred to, it's not a T11 thing.