 As mentioned earlier, in many discussions of structuralism, from the 1980s to the early 2000s and beyond, a few positions have taken center stage: Shapiro’s, Hellman’s, sometimes Parsons’, and occasionally Resnik’s. But other forms of structuralism have been around for decades too. These deserve, and are starting to get, more attention as well. Without any claim to comprehensiveness, we want to mention several noteworthy examples. A major one, whose origins can be traced back to before the 1960s, is “set-theoretic structuralism” (cf. Reck &amp; Price 2000, also Reck &amp; Schiemer forthcoming). To introduce it, let us reconsider the example central to Benacerraf’s 1965 paper: the natural numbers. 