If you see this indication, your pan is expired and should be thrown away.

Ezoic
Triple-ply stainless steel pans have a layer of aluminum between two layers of stainless steel. This allows the heat of the aluminum to distribute quickly and evenly with the heat resistance of the steel.

The triple layer thus acts as an excellent heat diffuser. However, you should always preheat the utensil before using it.

So if you’re looking for a pan that will last almost forever, choose this three-ply stainless steel utensil, which is both sturdy and versatile. This pan has no expiration date, because it can last forever.