Quick question.

I'm familiar with the well published numbering system on plastic bottles, but almost all the bottles in the house have something like the number surrounded by the 3 arrows that form the triangle, sometimes with initials that represent the plastic.

I have many 2L bottles that help a drink which simply have 02 in large numbers, nothing else. Many other bottles in the house have a large number like this away from the recycle number that is the same number, but two have differing numbers in this way.

Is there any way of know what these are made of? I'd like to for two reasons, 1 for their suitability as contains for my extract, and also for general use in other things, so if you know the answer please say.

Thanks, peace.