Question: Integral symbols - closed contour/surface/volume

Unless I'm missing something where are the closed integral symbols? 

I couldn't find them but you can create them if you wanted to.  Then I tried adding them to a palette with DocumentTools and couldn't get it to work. 

`∮` `∯` `∰`
                                                        

Creating the double and triple symbols can be done  easily by concatenating as many ∫  as you desire. But can't seem to add them to a palette.

DocumentTools:-AddPalette("Integral Symbols");

AddIcon("Closed Integral",`∮`)

I suppose you need to create a png file for that to work.  However the above would be simpler.

Maybe add functional closed integral operator symbols for the palette? 

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