ELEMENTS OF A ARCHITECTURAL FLOOR PLAN

[Anonymous]

Hi every body! I'm an architecture student from México, I'm about to graduate and lately i've been having this proposals of projects where we'll have to present the projects to both, Mexican and American costumers, to be honest this is more like an architecture based question.

So the question is what is the name for this circular element that labels the axis of the estructural elements in a floor plan? and is there any guide to recognize and learn the different names for each element and markers on a proper floor plan?

I'm an archicad user and I find this BIM software to be the best!
I've look for information on the web and I haven't found any clear answers.

Cheers and thanks in advance for any help!

(I have attached an image of the specific element))

[Steve Jepson]

Rotational Reference Marker.