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I just found the symbol ExpectationE with autocomplete.

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Rendered the symbol is

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Searching the documentation and the internet leads to nothing. Does somebody know what this symbol does and what its purpose is?

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    $\begingroup$ It seems to print a funny symbol in the front end. Try ExpectationE[x]. $\endgroup$ – QuantumDot May 8 '16 at 18:49
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    $\begingroup$ @QuantumDot, you can also get the same symbol with \[ExpectationE]. It looks like the Rx recipe symbol used in pharmacy, but instead with an Ex. It is a script E joined to a small and subset x. $\endgroup$ – Rashid May 9 '16 at 3:24
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    $\begingroup$ Presumably it provides notation for the expectation symbol? $\endgroup$ – Mr.Wizard May 9 '16 at 6:52
  • $\begingroup$ @Mr.Wizard That's exactly what it is... $\endgroup$ – ciao May 9 '16 at 7:08
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It doesn't do anything, it just formats in a certain way. You can assign your own definition if you like.

References:

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