⇔ left right double arrow

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Character info

Character⇔
UnicodeU+21D4
Korean name동치
Official nameleft right double arrow
CategoryMath symbol
HTML code⇔
JavaScript"\u{21D4}"

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.