Which term describes black out times for sales of various items?

The term that describes blackout times for the sales of various items is blue laws. Blue laws are regulations that restrict or prohibit certain activities, particularly on Sundays or during specified times, usually related to the sale of alcohol, household goods, or certain services. These laws were historically enacted to promote religious observance and moral standards in the community.

In the context of sales, blackouts might refer to times when the sale of specific items is not allowed due to these regulations. For example, a state may have laws that prevent the sale of alcohol during certain hours on Sundays, directly correlating to the idea of "blackout" periods for such sales.

The other options do not relate to this concept of restricted sales times. PLU promotions are related to product lookup codes used for pricing goods, taxes are obligatory financial charges imposed by the government, and fees are charges for services rendered. None of these convey the idea of enforced sales restrictions based on time or day like blue laws do.