What does this number mean?

This number, located under front hood, just forward of the radiator. 2000 Tacoma PreRunner ExtraCab. What does it mean?

 

its just a number they use to identify the truck when their built. no meaning besides that from my understanding
when a core support is replaced there is no number on the new part from toyota. so seeing that number there typically means that has never been replaced.

 

some Toyotas will put a serial number on body panels that corresponds with the truck. It's a way of easily identifying if a vehicle has had a panel or part replaced as part of a repair. You might find that same number on other panels.

or it could be totally unrelated. I've never looked for it, so I have no idea what that serial number looks like.

 

Cipher code for the self-destruct module

 

this is what it was used for (found in the head liner of my tundra)
used before the VIN is ever attached to the truck

 

@Empty_Lord Thanks, yours seems like the best answer, with a photographic example. Brilliant!

 

lol from what i was informed this piece of paper was from the paint shop. It wasnt suppose to be left in the truck, but 14 years after she was built i found it when i pulled the headliner down, stuffed up in the roof stiffener panel