Just means the chicks are not sexed.  If you buy straight run chicks, you do not know the sex of the chicks and they usually sell for less.

This means that the chick has broken through the egg shell and will start pecking in a round circle around the egg (like a zipper) until it has enough broken shell that it can push it’s way out.  The chick is born with a small tooth on top of it’s beak which is used to get out of the egg.