I am wondering if anyone knows the name or source of the symbol shown below from page 22 of the Second Edition of Feller's "An Introduction to Probability" Volume I.
2026-04-07 09:40:32.1775554832
"unity symbol" from Feller's "An Introduction to Probability"
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Seems to be $\mathfrak{S}$, the Fraktur S.
Detexify is a great tool for things like this!