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It looks like an unside down n with an '... :)
In set theory, the symbol of intersection is ∩, like an upside down U.
It's spelled 'sign', and it looks like a number ' 8 ' lying down on its side.
You hold down the option key or alt, and click zero, you will then get yourself a degrees symbol like this: º
It looks like the number 8 lying on its side. There is a symbol for it on most keyboard insert symbols, but not on this site. So look at the number 8 and tilt your head 90 degrees or lie on your side and that's it!