# A symbol on page 302 of Goldblatt's “Topoi [. . .]”.

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:

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I have tried using Detexify but to no avail.

What symbol is it?

• 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 :) – Shaun Jan 26 at 17:09