A relational symbol expressing asymptotic equivalence or approximate equality between mathematical expressions.
Examples
Asymptotic equivalence of functions
f(x) \eqsim g(x) \text{ as } x \to \infty
Equivalence of sequences
(a_n)_{n\geq1} \eqsim (b_n)_{n\geq1}
Asymptotic behavior in analysis
\sin(x) \eqsim x \text{ as } x \to 0