What's the meaning of ADJG, ADJI, ADJS in NOKIA?

Hello Experts,
What’s the meaning of ADJG, ADJI, ADJS in NOKIA?

ADJG 3G to 2G Handover.
ADJI Inter Frequency Handover.
ADJS Intra Freq Handover.

Also you may find AdjL for 3G to 4G HO.