You could use a polygon...

polygon {
    4, // number of corners
    <0, 0>, <0, 1>, <1, 1>, <1, 0>
}

Polygons can take 3D vectors, but they are
touchy about being flat, it's better to make
them 2D vectors then move it where-ever
if it isn't flat to one of the standard planes.

If you need a functional planar lamina you can
use an isosurface and let the containtained_by
box be mostly flat. Something like...
isosurface { // a cylinder
   function{ sqrt(pow(x,2) + pow(z,2)) - 1 }
   contained_by { box { <-2,-0.001,-2>, <2,0,2> } }
   threshold 0
}

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