What does the function E ( a | b ) mean?

Questions
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1
Open in Wolfram Cloud ↗

I asked it to Integrate a function and the output had a function E( a | b )
I think it might be an elliptic integral but that should come in the form EllipticE[a,b]

So what does it mean?

Any help is appreciated, thanks a lot in advance!

2

I Mathematica if I hover on the E, I get the tooltip EllipticE, whose traditional form is what you see.