Symbol found on most ammunition boxes

Hello everyone, new member here.

Does anyone know what the symbol on the box of IMI 9 Para
at the bottom of this thread means?

It is the last post on the page, the one by Mr. Curtis.
It looks like a ring with a ‘G’ or ‘L’ in it.
I have seen it on almost every box of ammo, but have never known what it’s for.

I have done several searches before posting, all to no avail.

Thank you all in advance

It is the symbol or trademark if you will, of the proofhouse that has tested the ammunition and found it within spec.
In this case it is the symbol for the proofhouse in Liege, Belgium.