Trevor went to the store to get a new pair of running shoes but the store was temporarily out of the brand he normally buys. What is the term for this situation?

The answer is : Out of Stock (OOS). This is the term for the situation where Trevor went to the store and found out that the store was temporarily out of the brand he usually buys. When a store is out of stock of an item it normally keeps, it has none of that item available to buy now.