What does the number 7 in the triangle at the bottom of a plastic bottle mean? Is it safe?

What does the number 7 in the triangle at the bottom of a plastic bottle mean? Is it safe?

In fact, in order to distinguish whether the material is safe or not, just look at the numbers at the bottom of the plastic container. Generally speaking, plastic products of different materials are marked with 1-7 numbers at the bottom, and the material type and safety information are reflected in these numbers

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