Just a humble suggestion - Have you tried making the lambda symbol rounded,
to match the sphere? For example:

#local Symbol = text {ttf "C:\Windows\Fonts\Arial.ttf" "S" 1, 0}

#local RoundedSymbol = object {
   union {
      intersection {
         object {Symbol translate <-max_extent (Symbol).x / 2, -max_extent
(Symbol).y / 2, -1.001>}
         sphere {0, 1}
         sphere {0, .96 inverse} //Separate symbol from sphere slightly
         texture {T_Chrome_3D}
      } //intersection
      sphere {0, .94 texture {pigment {color White} finish {specular .4
roughness .006}}}
   } //union
} //object

object {RoundedSymbol rotate 30 * y}

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