One's Essential Being.
The True "You"... that Exists apart from The Physical Body.
The Spiritual Essence of
The Term "SELF" is a New One Coined by SEU to Mean The "Spiritual Self" that is Essentially Part of Universal Reality.
The Purpose and Intent is to Distinguish and Contrast within Verbal Language The Terms "Self" (Orthodox) and "SELF" (Essential).
It is very Similar to The Common Term "Self"... in that it refers to "The total, essential, or particular being of one person; the individual"... but is more Encompassing in that it is Relative to Universal Reality.