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Do you mean this symbol ∈ (or backwards 3) if so, it means is an element of;

Also, ∉ (with strikethrough) (or backwards 3 with strikethrough)

is the symbol for "is not an element of" used in set membership.

See also

Element (mathematics) and

Set (mathematics)

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12y ago
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Q: What does a backwards 3 mean in mathematics?
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