A is for Adam's questionable space hippie wardrobe and haircut.
B is for "B-Deck. In or around Engineering." Should have hid in the brewery.
C is for Chekov. In either timeline or any universe he often had very, very bad hair.
D is for Darwin Genetic Research Station.
E is for Exeter, the Constitution-class starship commanded by the respected Captain Ronald Tracey until the Omega IV incident of 2268.
F is for Fesarius. Flagship of the First Federation.
G is for Gorn spaceships. We never got to see one up-close and in detail, but they had nacelles of some sort.
H is for Haven. Paradise planet.
I is for Isolinear optical processor technology.
J is for Jarada. An insect-like species.
K is for the Klingon High Command, located on Qo'noS.
L is for Lissepian smugglers.
M is for Minshara-class planets, also known as Class-M planets in the time of the Federation.