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He was possibly referring to the XSS "acronym" that the author of the library uses both in the code and in the example. https://github.com/myliang/x-spreadsheet/search?q=xss

>> I have literally never seen spreadsheet abbreviated as SS.

I thought it was pretty common. I guess it depends on the environment you work in.

How should the spreadsheet be abbreviated ? 's' first letter

I don't abbreviate it that way either, but the author does on the page itself!