The astral body.
"...in the beginning, after the organ Kundabuffer with all its properties had been removed from their presences, the duration of their existence was according to the ‘Fulasnitamnian’ principle, that is to say, they were obliged to exist until there was coated in them and completely perfected by reason what is called the ‘body-Kesdjan,’ or, as they themselves later began to name this being-part of theirs—of which, by the way, contemporary beings know only by hearsay—the ‘Astral-body." -Gurdjieff, Beelzebub's Tales to His Grandson