A is for the Antares Maelstrom.
B is for Beta Antares.
C is for Ceti Alpha V.
D is for Denobula Triaxa.
E is for Elba II.
F is for the Fabrini Homeworld.
G is for Galorndon Core.
H is for Haven.
I is for Ingraham B.
J is for James Cromwell, Trek actor.
K is for Kaminar, home of the Ba'ul. Oh, and the Kelpiens.
L is for Lumba, Quark's name as a woman.
M is for Morn's siblings.
N is for the Norpin Colony.
O is for Odo putting on safety goggles instead of either morphing them or just doing nothing. He's shown previously to be invulnerable to sharp objects.
P is for Peliar Zel.
Q is for the Quantum Universes, where we saw different versions of Worf et al.