This is a key for a LieAlgebra L, which can be seen by applying peekLie to L.
i1 : L=lieAlgebra{a,b,c}/{a b, a a b - a a c} o1 = L o1 : LieAlgebra
i2 : L.compdeg o2 = 1
i3 : dimsLie 3 o3 = {3, 2, 4} o3 : List
i4 : L.compdeg o4 = 3
The object compdeg is a symbol.