Short answer
ProjectMoon presents E.G.O as equipment originating from Abnormalities. The official world entry describes weapons and armor extracted from Abnormalities, while the game-system section says E.G.O can take different forms and functions depending on who uses it.
How E.G.O fits the roster
The twelve Sinners remain the permanent characters. They can borrow different Identities and use E.G.O. Steam describes team construction as combining Identities with equipped E.G.O to create synergies.
This page does not treat E.G.O and Identity as interchangeable. An Identity is an alternate possibility for a Sinner; E.G.O is a separate system associated with Abnormalities.
Why the acronym is not expanded here
Search questions frequently ask what E.G.O “stands for.” The checked official English pages consistently use the punctuated term but do not provide a reliable expansion in the material used for this guide. Supplying an unsourced expansion would turn inference into fact, so the site leaves the term as ProjectMoon publishes it.
What is outside this overview
Individual E.G.O performance, exact costs, Threadspinning details and rankings are patch-sensitive. E.G.O Gifts are also a distinct Mirror Dungeon topic and are not folded into this page merely because the names overlap.
Those subjects will receive separate pages only after current structured data, source rights and mapped images are available.