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From Wiktionary, the free dictionary

U+2208, ∈
ELEMENT OF

[U+2207]
Mathematical Operators
[U+2209]
U+220A, ∊
SMALL ELEMENT OF

[U+2209]
Mathematical Operators
[U+220B]

Translingual

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Etymology

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From the Ancient Greek letter ϵ (lunate epsilon). The coinage is commonly attributed to Giuseppe Peano, who used the letter epsilon for set membership in his two papers from 1889.[1]

Symbol

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  1. (mathematics) Is an element in the set of…
    x denotes that x is within the set of natural numbers.

Derived terms

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References

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