Another true name

As Severian is getting ready to depart the ship that has taken him to Yesod and back to Urth, he makes the following comment (URTH, p.187): "Together we left the ship, and it was only when I paused at the threshhold and turned to look back that it struck me I had never known her true name..." The ship's true name can be translated several different ways, two of which are the Fortunate Cloud and the Quasar. The broader implications of this (and there are several major ones), I'll leave for others to elaborate. (Throughout the New Sun Five, we meet and remeet many old friends and foes.) Robert Borski