∉ not an element of

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Character info

Character∉
UnicodeU+2209
Korean name원소가 아님
Official namenot an element of
CategoryMath symbol
HTML code∉
JavaScript"\u{2209}"

Names and categories come from official Unicode 18.0.0 data. Korean names are ours. Unicode UnicodeData.txt 18.0.0 (Unicode License v3)

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More on typing by system in the keyboard guide.