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I was reading a LateX document about different symbols and found one called \eth: $\eth$.

Or very similar \dh

It's supposed to be a mathematical symbol, what does it mean?
It looks like a partial derivative but with a strike on it.

skan
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    Is a letter of the alphabet that fell out of use in the transitional period between Middle and Modern English. It's still used in Icelandic, though. –  Nov 26 '16 at 00:59
  • Yes, but what does it mean in mathematics? $\pi$ is a greek letter but also the ratio of a circle's circumference to its diameter, the number 3.1415... – skan Nov 26 '16 at 01:07
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    What makes you think that it's used in mathematics? –  Nov 26 '16 at 01:09
  • Not sure, just asking, but it appears on a Latex list of symbols near other such as derivatives and integrals. – skan Nov 26 '16 at 01:10
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    $\pi$ might also mean a projection, depending on the context. Symbols and concepts are not in one to one correspondence. – Alp Uzman Nov 26 '16 at 01:13
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    @skan If you clicked Bye_World's link you would have read the following line: "The letter $\eth$ is sometimes used in mathematics and engineering textbooks as a symbol for a spin-weighted partial derivative. This operator gives rise to spin-weighted spherical harmonics." – Ian Miller Nov 26 '16 at 01:21
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    Just a pointer: using mathjax on this site, you need only have written $\eth $ to get $\eth$, or enlarged, $\Huge \eth $ to get $\Huge \eth$. – amWhy Nov 26 '16 at 01:22
  • Why the downvote? – skan Nov 26 '16 at 11:59

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Nothing special, it is just a symbol. You can even define it as a natural number if you want. A symbol itself means nothing deep in mathematics.

As @Bye_World pointed out, people sometimes uses it to denote a differential operator, as the linked Wikipedia article shows.