What does "F" mean in "Mushrooms 3.94 F" of my grocery receipt?

What does "F" mean in "Mushrooms 3.94 F" of my grocery receipt? I guess it means I paid 3.94 US dollars for mushrooms, but I don't understand why.


F on a grocery receipt generally refers to whether or not it was a food item. Food items are not usually taxable, whereas other types of items, such as general merchandise, are.