If you've ever bought fruit and veg from Tesco, you may have noticed that the packaging sometimes comes with a small code printed on the front, usually comprised of one letter and one or two numbers.
And while the meaning of this code is a mystery to most of us, Tesco employees are told what it means during staff training - and one of them has now spilled the beans online in a viral video.
According to the employee, the code is meant to replace traditional use-by and sell-by dates and tells you how fresh your produce is and how long it's supposed to last.