A is for Andorian aggression, antennae and abrasiveness.
B is for Bajoran Buggerers.
C is for Corbomite. A Double Ultra Top-Secret material that will kill you if you shoot at it.
D is for Dimorus.
E is for Exeter.
F is for the Farragut. One of James Kirk's earlier postings; commanded by Captain Garrovick. NuUhura likes to call it the "Fairy-Gutt".
G is for Gomtuu.
H is for Harry Mudd's jaunty hat he wore during his first-ever encounter with the Enterprise 1701 crew in 2266.
I is for Iconian myths. Like all myths in Star Trek, they're 100% true.