The prefix "activated" usually means condensation of a sugar molecule like glucose with a nucleotide. Examples are uridine-5'-diphosphate (UDP) for activation of glucose, galactose or N-acetylglucosamine, guanosine-5'-diphosphate (GDP) for mannose or fucose and cytidine-5'-monophophate (CMP) for sialic acid.
Activation of sugars helps in biochemical transfer of sugar molecules to certain structure, e. g. N-glycans.