What is an example of a normal vector to the horizontal plane?

I'm not sure what it means by horizontal plane and need to find a normal vector to it so I can find the angle between this and another plane. Thanks in advance.What is an example of a normal vector to the horizontal plane?Typically a horizontal plane if considered an x-y-plane, so the z-axis is normal to this plane. So a normal vector would be n = %26lt;0,0,1%26gt;.

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