What are 4 items that have rotational symmetry?

Answer 1

The four brightest moons of Jupiter if the moons are in a straight line. Rotated 360 degrees.
Or, two on each side 180 degrees turns.

The solar system if the planets are all in conjunction at the same time.

The sun or sol.

A double Pendulum fractal

Just a guess.

Answer 2

A Square, a circle, an equilateral triangle and a hexagon
Thats my guess.
Try askin this question in maths. if thats the sort of thing your after.
If this has bugger all to do with your question, my apologies for COMPLETELY misunderstandin the question.