#### Answer

$\emptyset$.

#### Work Step by Step

Step 1. Rewrite the inequality as $(x-3)^2\lt 0$; we can see that the solution is an empty set $\emptyset$.
Step 2. An empty set on a real number line will not show any features except a bare line; thus it will not be provided.
Step 3. We can not express an empty set using an interval notation.