Dof stands for degrees of freedom. It’s a robotics term that defines the number of axis on a system.
KevinBerger
@ergun
in robotics, it has nothing to do with the number of Axis, if used properly. It has to do with the ability of the item in the manipulator to be changed in reference to the world space. The reason for this is that technically a 5/6/7 axis robot can give a part all 6 DoF's, but have different number of axis's. The 6 DoF's are +/- X, Y, Z, and rotation around said axis. As shown in this picture I copied from Wikipedia. https://en.wikipedia.org/wiki/Six_degrees_of_freedom 
I have been reading through the DoF community, and believe it is very helpful and strengthens the utilization of cobots. Not sure of the meaning of the letters DoF?