Commentary Par XVIII 97-99

Other souls, descending (from where we are not told, but it is difficult to imagine from anywhere else but the Empyrean), not those who had paused in their 'skywriting,' appear to make a 'cap' on the midpoint of the top of the 'm,' which then resembles (as we learn in [Par XVIII 133]) a lily, as well as a capital 'M' in Gothic script.