The Mysterious History of the Ellipsis, From Medieval Subpuncting to Irrational Numbers

The punctuation mark of the ellipsis is perhaps the most unusual mark in the English language, for punctuation marks are designed to convey meaning by indicating relationships between ideas, but the ellipsis does the exact opposite. It simply indicates that something has been omitted. Where did the ellipsis come from and how did it end up being so unusual?
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