TNG = The Next Generation, as in Star Trek: The Next Generation which was the second series in the franchise.
You'll see these abbreviations for the various Star Trek series:
TOS: The Original Series - USS Enterprise NCC-1701
TMP: The Motion Picture(s) - USS Enterprise NCC-1701 (refit) and NCC-1701-A
TNG: The Next Generation - USS Enterprise NCC-1701-D
DS9: Deep Space Nine
VOY: Voyager
ENT: Enterprise - Enterpise NX-01
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