∈
See also: Appendix:Variations of "e"

TranslingualEdit
EtymologyEdit
From the 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]}
SymbolEdit
∈
 (mathematics) Is an element in the set of…
 x ∈ ℕ denotes that x is within the set of natural numbers.