# What is ExpectationE and what does it do?

I just found the symbol ExpectationE with autocomplete.

Rendered the symbol is

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

• It seems to print a funny symbol in the front end. Try ExpectationE[x]. – QuantumDot May 8 '16 at 18:49
• @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. – Rashid May 9 '16 at 3:24
• Presumably it provides notation for the expectation symbol? – Mr.Wizard May 9 '16 at 6:52
• @Mr.Wizard That's exactly what it is... – ciao May 9 '16 at 7:08