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Encyclopedia.com lists the following symbol for "corresponds to":

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The source they give is "Oxford University Press", although I am not sure which exact work they used. But they list the symbol, and the stated meaning of "corresponds to" is the one in which I have been using the symbol for decades.

The symbol also appears in Unicode, where it is called "estimates". (It is Unicode symbol U+2259.)

It does not, however, appear to exist in Latex.

What are its history and current usage?

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    This isn't a math question. That said, I have never seen this used. – lulu Jun 21 '21 at 21:11
  • @ruffle You can use \hat{=}: $\hat{=}$ – Jair Taylor Jun 21 '21 at 21:13
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    @lulu: this question is completely on-topic for the "Notation" tag, which is for questions "on the meaning, history, and usage of mathematical symbols and notation." Unicode say it's a mathematical operator called "estimates". Curiously for "corresponds to" they use another symbol, U+2258, ≘. Perhaps you are more familiar with the latter? –  Jun 21 '21 at 21:19
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    Asked here. It has an answer, but not references either. – plop Jun 21 '21 at 21:28
  • Just in case anyone else is curious, here's the link: https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/basic-mathematical-symbols. – Hans Lundmark Jun 22 '21 at 08:53
  • Kindly reopen this question immediately, which must have been closed by mistake because it patently obviously does meet the company's guidelines. Thanks. –  Jun 25 '21 at 07:44

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Is that a British usage? I have been doing mathematics for a very long time and have never seen that symbol. In fact, if I ran into the statement that "A corresponds to B" I would expect a definition of the exact correspondence.

user247327
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  • I learnt it in Britain and have always called it "corresponds to". Codepoints call it "corresponds to" too, although in Unicode its name is "estimates". –  Jun 21 '21 at 21:26
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Are you looking for \widehat =? It looks like $\widehat=$.

Andrei
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