A is for the Archon, which visited planet Beta III in the year 2167 and was pulled from orbit and destroyed by the ruling planetary computer system called Landru.
B is for B-Type warbird.
C is for Camus II life energy transference technology uncovered during an archaeological expedition in 2269.
D is for the Dilithium mining colony on Rigel XII. Surely Ben and his pals are using robotic technology to mine for those crystals.
E is for Elaysians and Elasians. Different humanoid species with different appearances, but very similar and confusing spellings.
F is for Fat Starship Captains.
G is for Garak's espionage career with the Obsidian Order.
H is for Holodeck malfunctions.
I is for Ilia of planet Delta IV.
J is for Jupiter Station.
K is for Klingon D5 battle cruisers. They were considered obsolete and had been decommissioned by the late 23rd century.
L is for Lal. Data's child.
M is for the Mars Defense Perimeter of Sector 001. It utterly failed to stop the invading Borg cube at the beginning of 2367.