A is for Atomic Bombs. Used by some species in warfare, to some not very nice consequences.
B is for Bajoran terrorists.
C is for the Capellan kligat.
D is for Darmok.
E is for Edosian suckerfish.
F is for Federation Funny Farm.
G is for the Gorlan uprising in the Mirror Universe.
H is for Halkan pacifism in the Mirror Universe.