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Megaten? What is that?

Since Atlus® is fond of rather long names, and fans generally aren't, shortened names have been created for the series and its various games. Megaten is short for (Shin) Megami Tensei and refers to the entire series, all spin-offs (Digital Devil Saga, Persona, Devil Summoner, etc.) included. Individual games are most often referred to by the acronym of their titles to shorten them as well. Here are the most common ones found in the English fandom:

SMTI
Shin Megami Tensei 1
SMTII
Shin Megami Tensei 2
SMTN
Nocturne
Shin Megami Tensei: Nocturne
DDS
Shin Megami Tensei: Digital Devil Saga 1
DDS2
Shin Megami Tensei: Digital Devil Saga 2
DS
DSR
SA
Soulless Army
Shin Megami Tensei: Devil Summoner – Raidou vs The Soulless Army
P2
Persona 2. Usually refers to Persona 2: Eternal Punishment, the only Persona 2 part that was released outside of Japan. The other part and prequel is Persona 2: Innocent Sin.
P3
Shin Megami Tensei: Persona 3
P3FES
FES
Shin Megami Tensei: Persona 3 FES
P4
Shin Megami Tensei: Persona 4
DS2
DSR2
KA
King Abaddon
Shin Megami Tensei: Devil Summoner – Raidou Kuzunoha vs King Abadoon