ec429 comments on How to Convince Me That 2 + 2 = 3 - Less Wrong
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SS0 isn't a free variable like "x", it is, in any given model of arithmetic, the unique object related by the successor relation to the unique object related by the successor relation to the unique object which is not related by the successor relation to any object, which is how mathematicians say "Two".
Although as a mathmo myself I should point out that, to save time, we usually pronounce it "Two". :)