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I'm reading Goldblatt's "Topoi: A Categorial Analysis of Logic."

There's a symbol I don't recognise on page 302 of the copy with International Standard Book Number 0-486-45026-0. It's in the definition of a natural number object and resembles a cross between $s$ and $\sigma$.

For lack of a better format to show you what it is, here is a picture:

Natural number object symbol.

I have tried using Detexify but to no avail.

What symbol is it?

Please help :)

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That symbol looks like a cursive letter s (lower case).

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    $\begingroup$ From that Wikipedia article: Cursive has been in decline throughout the 21st century due to its perceived lack of necessity. The largest teachers' union in Fairfax County, Virginia, has called cursive a "dying art" $\endgroup$ – J. W. Tanner Jan 26 at 17:07
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    $\begingroup$ Your answer would make sense in the context. The motivating example for an nno talks of the successor function on the natural numbers, denoted $s$. Thank you :) $\endgroup$ – Shaun Jan 26 at 17:09

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