A is for Alphas, a special breed of Jem'Hadar bred in the Gamma Quadrant during the Dominion War.
B is for Born to fight, which is true of the Jem'Hadar
C is for the Conquering Dominion. Hail to them!
D is for Dominion, the ruling power in the Gamma Quadrant
E is for Enabran Tain, who was captured and held prisoner in a Dominion internment camp located inside the Gamma Quadrant
F is for Freaky shape-shifting aliens.
G is for Gods, which the Vorta and Jem'Hadar believed the Founders to be. Well, at the very least they treated them like gods.
H is for Heaven. To get to the Gamma Quadrant from the Alpha, you have to go through Bajoran heaven.