To solve the equation \( 36x^2 = 0 \), we first isolate \( x^2 \):
\[ x^2 = 0 \]
Taking the square root of both sides, we find:
\[ x = 0 \]
Thus, the solution is just \( x = 0 \). In set notation, the solution set can be expressed as:
\[ {0} \]
Therefore, the correct response is:
{0}