1944 P Nickel

Yup, it's a "lamination peel" It happens when alloy coins don't mix properly and have a layer of unbonded material between two layers of metal. The top layer peels off before or after the strike and results in what you have there. The difference between before and after the strike is whether or not the devices in the affected area are sharp, and yours don't appear to be - so it would be the more common "split after strike" version. In most cases these don't command any premium value because they are pretty common. Yours, however, looks just neat enough to sell for a novelty value above the normal silver nickel price - probably around $5 in VF/EF.

These are most common in buffalo and Jefferson nickels, but also show up quite commonly in earlier Lincoln cents. I haven't seen many silver coins with this problem, and have never seen a gold coin with the same issue.

The clad layered coins have a completely separate bonding issue, and an error on which the nickel layer splits off the copper it's called a, "split clad layer." This is different from laminated planchets.