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9eB1 comments on Bridge Collapse: Reductionism as Engineering Problem - Less Wrong
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It's used in Microsoft Excel. If you have multiple worksheets, you preface a cell reference with "<sheetname>!" to specify which sheet you want that cell reference to be resolved on.
i.e.
"A3" means "the value of the cell in column A, row 3, on the current sheet", whereas
"Sheet1!A3" means "the value of the cell in column A, row 3, on Sheet 1".
I always assumed it was a reference to bang paths. It seems more likely to me that Eliezer would reference something that appears in the Jargon File than syntax from Excel.
Well, Eliezer presumably is referencing something that appeared in fanfiction/Tumblr/etc. culture; where said culture got the notation has nothing to do with Eliezer.
Bang paths seem an unlikely candidate, as they don't actually make a good metaphor for what's being conveyed here.
Interesting. I did not know that it was used prior to him, and I apparently have poor reading comprehension. I definitely agree that the Excel metaphor makes more sense.