BIPPUthis!

I never paid attention to this and I've had my car for years....does everyone have a sticker/label on the lower cam cover just above the pulleys? its a barcode with series of numbers. The 2jz is a given but there are series of numbers on the top of the barcode.....what are the numbers used for and do they also show anywhere else in the car?. Just curious....for some reason I don't remember seeing a sticker there. I guess I never paid attention to it. It is located on the lower cam cover.