Asmus, I would be happy to hear your opinion on my question, in context of which I may not have been clear on that my intent is not to propose a general character for all uses as end-of-story sign but a well-defined symbol based on both shape and usage pattern (a perfect filled square, appropriately sized based on x-height or whatnot, used as end-of-story sign). The name may well be something more visually descriptive, not necessarily END OF STORY.
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