Right lol I’m in uk n got 15 the obvious ones n hospitality ones cos that was my job for decades lol but a few I was like wait what never seen it before 🤷‍♀️funny enough I got those right 😂

It's kind of silly, because it symbolizes OU (The U inside of an O) for Orthodox Union, which is a network of synagogues, youth programs, Jewish and religious Zionist advocacy, etc. and is based in New York. So probably not relevant for most Afro-Eurasian and Oceanic Pandas.

Ionisation/nuclear is a small circle with a large one around it broken into six parts of alternating colours (usually yellow and black). The triple triangle is a fallout shelter logo, first created in America because Cold War etc etc. I think it's supposed to resemble the nuclear symbol whilst being sufficiently different that people shouldn't mix them up.

Depends which county you're in. Here the barcode is to identify the product. All items already have tax included so the price you see is the price you pay. For items that need weighing then the barcode is to identify the product which is weighed on the pressure sensor at the till.

Technical name is Universal Product Code (UPS).