What is the partial differential symbol (bent lowercase $d$) with an $x$ at the top?

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From a government website on global warming:

$PT = LT / (1 - s)$, where the sensitivity coefficient $s = ðln(LT) / ðln(B)$ and $B =$ burden.

I have seen this before, yet there is never an explanation as to what it means.....

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This has nothing to do with mathematics, but limitations of the website infrastructure. The character is Icelandic eth, which merely looks the most like $\partial$ while staying in Latin-1.

$\partial$ in HTML is U+2202, ∂.