None

is a setting used for certain options.

Examples

For ContourPlot, use None to only show the contour lines:

Wolfram Language code: ContourPlot[Sin[x y], {x, -1, 1}, {y, -1, 1}, ContourShading -> None]

Plot only mesh lines:

Wolfram Language code: ParametricPlot3D[{Cos[x]Cos[y], Cos[x]Sin[y], Sin[x]}, {x, 0, Pi}, {y, 0, Pi}, PlotStyle -> None]

Use None to indicate holes or no content for mesh regions:

Wolfram Language code: Plot3D[Sin[x y], {x, 0, 3}, {y, 0, 3}, Mesh -> 8, MeshShading -> {{Orange, None}, {None, Blue}}]

Use None to indicate no vertex labels should be used:

Wolfram Language code: TreeForm[Nest[{#, {#}, #}&, x, 4], VertexLabeling -> None]

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