# What is the meaning of the J value in term symbols [closed]

I understand how to work out the J values of term symbols.

e.g. a d1 configuration gives J values of 5/2 and 3/2. resulting in 2D 3/2

However I dont understand the meaning of it, and why it arises.

For multi-electron atoms where the spin-orbit coupling is weak, it can be presumed that the orbital angular momenta of the individual electrons add to form a resultant orbital angular momentum $$\bf{L}$$.

Likewise, the individual spin angular momenta are presumed to couple to produce a resultant spin angular momentum $$\bf{S}$$ . Then $$\bf{L}$$ and $$\bf{S}$$ combine to form the total angular momentum $$\bf{J} = \bf{L}+ \bf{S}$$.