It means foods that has been irradiated.
Una radura was created in 1977.
frozen food
食
There is no ticker symbol for Giant Food's as it is a privately held company.
Ag is the chemical symbol for gold but not a food.
bread
kft
Its mean that food product is vegetarian.
there isn't one
snail
The symbol is a U inside the letter O and stands for the Orthodox Union, one of the world's largest kashrut certification organisations. When this symbol is on a food package, it means that the food is certified kosher.
One can purchase food that is kosher at bakeries that are supervised by rabbis. This will ensure that the food is in fact genuinely kosher. Also, some foods may carry a "hekhsher" symbol on the packaging. If the symbol is on the packaging, the food is kosher.