A is for Altair system.
B is for Bolius. Best barbers in the Alpha Quadrant.
C is for Cestus Comets, a late 24th century baseball revival team.
D is for Data. The android that has a cat.
E is for Excelsior-class starship. The Great Experiment. The class was still in widespread use almost an entire century after the first vessel was launched.
F is for the fabulous Ferengi. Greed is good indeed.
H is for Hairy. Tribbles were this. As were some Starfleet officers.
I is for Iconians. Demons of air and darkness.
J is for Janeway's hair. It changed a lot but was always presentable.
K is for Klingon Love Poetry.
L is for Laughing. Vulcans rarely did it, but when they did....look out. Trouble's a-brewin'.
M is for Microtomographic analysis.
N is for Nanotechnology.
O is for "Ohhhh, my!" (George Takei's catchphrase).
P is for Persephone V.