None
is a setting used for certain options.
Examples
Basic Examples (4)
For ContourPlot, use None to only show the contour lines:
Use None to indicate holes or no content for mesh regions:
Use None to indicate no vertex labels should be used:
Wolfram Research (1988), None, Wolfram Language function, https://reference.wolfram.com/language/ref/None.html.
Text
Wolfram Research (1988), None, Wolfram Language function, https://reference.wolfram.com/language/ref/None.html.
CMS
Wolfram Language. 1988. "None." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/None.html.
APA
Wolfram Language. (1988). None. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/None.html