Peeping is their noise, pipping is part of the hatch process. There is no term used call cracked, crack, or cracking.
You have:
Embryo growth
Internal PIPPING (where the bill breaks through the membrane into the air cell)
External PIPPING (where they create the pyramid shaped first hole in the shell)
Zipping (is the process of turning inside the shell and pipping additional spots allowing the top to move away from the bottom of the egg and freeing the hatchling.)
You don't assist in these stages unless you are a seasoned hatcher (in my Oppinion) you can cause a great deal of damage in a very short amount of time if you are going too fast, in the wrong spot, too large, too soon.
You have:
Embryo growth
Internal PIPPING (where the bill breaks through the membrane into the air cell)
External PIPPING (where they create the pyramid shaped first hole in the shell)
Zipping (is the process of turning inside the shell and pipping additional spots allowing the top to move away from the bottom of the egg and freeing the hatchling.)
You don't assist in these stages unless you are a seasoned hatcher (in my Oppinion) you can cause a great deal of damage in a very short amount of time if you are going too fast, in the wrong spot, too large, too soon.