\leqq
The symbol \leqq is used in mathematical expressions to denote 'less than or equal to' with a double equal sign. It is a relation symbol that is often used in inequalities to express that one quantity is either less than or exactly equal to another quantity.
x is less than or equal to y
x \leqq y
The sum of squares of a and b is less than or equal to the square of c
a^2 + b^2 \leqq c^2
n is less than or equal to 10
n \leqq 10