A is for Andorian shingles
B is for Botany Bay
C is for Captain Kurn
D is for Data's beard
E is for "Excellent idea, Sir!"
F is for Federation Day
G is for Gomtuu
H is for "Help me Spock!"
I is for Iridium Patch from STVI. Spock goes "Here, let me slap this big Iridium patch on your shoulder Captain. Nobody will see it, even though it's big and a black on a red uniform and at eye level. Sure nobody will see it." Stupid Klingons.
J is for Janeway
K if for Kronos One
, the ship full of the stupid Klingons who missed the Iridium Patch.
L is for Leeta
M is for "Moogie" (Leeta's mother-in-law)
N is for Nog, Moogie's grandson.
O is for Obsidian Order
P is for Polarity, which Scotty usually has to reverse.
Q is for Quarantine. Tripp and Hoshi were kept in quarantine in the episode "Observer Effect".
R is for Radiation
S is for shore leave
T is for T-Negative, a rare Vulcan blood type, both Sarek and Spock have this type.
U is for U'tani, a race from the Enterprise episode 'Rajiin'