\lessapproxThe symbol \lessapprox is used to denote that one quantity is less than or approximately equal to another. It is often used in mathematical contexts where precision is not exact, but an approximate relationship is sufficient.
x is less than or approximately equal to y
x \lessapprox yThe sum of squares of a and b is less than or approximately equal to the square of c
a^2 + b^2 \lessapprox c^2The function f(x) is less than or approximately equal to g(x)
f(x) \lessapprox g(x)