#### Answer

$(0,-3)$

#### Work Step by Step

The point $S$ is $0$ units to the left or right of the origin, so it has an $x$ coordinate of $0$. It is $3$ units below the origin, so it has a $y$ coordinate of $-3$. Since coordinates of a point are written in the format $(x,y)$, the coordinates of point $S$ are $(0,-3)$.