What is it?

[Unitedstatesofamerica1]

Dug up in my backyard looks like stone inside of it

 

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[desertexplorer]

Looks like the remains of a brown porcelain insulator...

 

[ARC]

Chocolate covered donut ? ? ?

:P

Nahhh I will also go with desertexplorer with an electric insulator.

 

[The Rebel]

Pottery or could be....

 

[desertexplorer]

Great.., now I’m hungry for Jr Mints

 

[Back-of-the-boat]

I think desertexplorer is correct with it being part of a broken porcelain telephone pole insulator.

 

[desertexplorer]

This is most likely the style insulator that your find would have been. The hump on the insulator in your second photo would have been the top. This style insulator was common on old farm houses and barns.