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I like the idea it could have been used for borders. .............................. ⋮ ⋮ ⋮.............................⋮

• OskarS 7y ago
  It's a really rather advanced use of typography (making borders) for such a simple machine that didn't even have parentheses. But yeah, it's plausible, and I like the authors theory that it was intended to be a vertical bar, but it was replaced with three dots to avoid confusing it with I and 1.
  • russellbeattie 7y ago
    The author suggested the borders idea as well. I didn't come up with it, I just illustrated it.