Symbole mathématique inclusion
Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/9/9a/NumberSetinR2.svg/1200px-NumberSetinR2.svg.png
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Symbole mathématique inclusion
Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/9/9a/NumberSetinR2.svg/1200px-NumberSetinR2.svg.png