I am not sure I am familiar or have seen this - could you perhaps post a screenshot of where you see it?
And to clarify you do not mean "Formation Type"? For example with Formation Type you may have "Front","Army","Construction",etc. Or you may be seeing the types of HQ capacities that are covered in 21.11.3?
No, it's not the Formation Type.
If you click on a HQ counter on the map, opening its Unit's display, up in the header, you can see, among others, 'Formation Role', that can assume : 0=none, 1= security, 2=defend, 3=attack