Answer:
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
I have three hundred cattle, with a single nose cord
If you have it, you want to share it. If you share it, you don't have it.
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
Three little letters, a paradox to some. The worse that it is, the better it becomes.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.