A negated relational symbol indicating "not less than or equal to" with slanted lines in ordered sets and inequalities.
Examples
Negating a less-than-or-equal relation between numbers
5 \nleqslant 3 \text{ since } 5 > 3
Comparing function values
f(x) \nleqslant g(x) \text{ for all } x > a
Inequality in partial ordering
\text{For elements } a,b \in P\text{, if } a \nleqslant b \text{ then either } a > b \text{ or } a \parallel b