\leqslant
The symbol \leqslant is used to denote 'less than or equal to' in mathematical expressions, providing an alternative to the standard \leq symbol with a more stylized appearance.
Indicates that x is less than or equal to y.
x \leqslant y
Used in inequalities involving squares of numbers.
a^2 + b^2 \leqslant c^2
Expresses that the sum of a series is less than or equal to a certain value.
\sum_{i=1}^{n} a_i \leqslant b