A is for Ambassador-class starships of the 24th century.
B is for Bajoran Boobage.
C is for the Capellan star system.
D is for Dilythium Miners. For some reason they seem to think that it's 1875 and they're living in the 'Ancient West".
E is for the Enterprise-C, the only starship named Enterprise as of the late 24th century to have been commanded by a female captain.
F is for Federation Funny Farm.
G is for Green. The creepy Lt Green either as himself or as portrayed by the salt vampire.
H is for the Hirogen.
I is for IDIC. Very near and dear to Vulcans.
J is for Jupiter Station, which already existed as a facility before the birth of the Federation.
K is for Kolandans. Maybe they're not all dead. Maybe they just quarantined Losira's world.
L is for Lursa, sister of Duras and B'Etor.
M is for Mugato horn.
N is for Nanoprobe injectors.
O is for Orb. The Prophets left a few.
P is for the Potemkin, William Riker's Starfleet posting before he joined the crews of the Hood and then the Enterprise-D.
Q is for Quasar-like phenomena.
R is for the Romulan Senate.
S is for Spock's posterior.
T is for T'Pol's bum. Aka, her posterior.