Sesqui-colon stigmata

Response to Mike Cannell's response.

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Why is it a 'semi'-colon? In what way is the semi-colon functionally half a colon? Can one create a scale of the magnitude of punctuation? Does a semi-colon denote half of the pause of a colon? Would a comma be half of that? Both punctuation marks (colon and semi-colon) join, but in different ways.

What would a sesqui-colon look like? A deca-colon? A giga-colon?

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My hands are currently astigmatic but only one of my eyes.