What does the symbol mean in the FittedModel

When doing the following NonlinearModelFit, the FittedModel (see attached screenshot) has the symbol <<83>>; what does this mean? I didnt see any description in the Documentation center. The code is:

data = Table[{x, x^2}, {x, 10}]; nlm = NonlinearModelFit[data, Exp[a x], a, x, WorkingPrecision -> 50] 

enter image description here