Which figure has an order 3 rotational symmetry?

An figure that has an order 3 rotational symmetry can be rotated 120 degrees around its center and still look the same, meaning it can be rotated three times (including the original position) to complete a full rotation of 360 degrees.

Among the options given:

- **Right triangle**: does not have rotational symmetry.
- **Equilateral triangle**: has order 3 rotational symmetry (120 degrees).
- **Regular hexagon**: has order 6 rotational symmetry.
- **Right trapezoid**: does not have rotational symmetry.

Therefore, the figure that has an order 3 rotational symmetry is the **equilateral triangle**.