Answer:
It happens when something has been cut with H2O.
You can read it both ways, I wearΝΎ One way it's a number, reversed a snare.
What goes with a car, comes with a car, is no use to a car but a car cannot move without it?
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
I am whole but incomplete. I have no eyes, yet I see. You can see, and see right through me. My largest part is one fourth of what I once was.
I can only be played on a windy day