Although it sounds like a fun accessory, this phrase has a truly dark explanation.As summer begins to come to a close, it’s normal to hear about all things back-to-school. Shopping is one activity that is common to hear about at this time—after all, going to the store for new school clothes and accessories is exciting for both kids and parents.

But if you hear students discussing back-to-school necklaces, it’s important to note that they’re not talking about a new, cute piece of jewelry. Instead, it’s a troubling phrase (that doesn’t seem alarming on the surface) you might hear in conversation or see on social media. So what exactly is a back-to-school necklace? We explain.