[kaysions]

From Wikipedia:

In medical terminology, a piece of dry or semi-dry nasal mucus is known as a rhinolith. Rhinoliths form when the mucus traps dust and other particles in the air. Mucus dries around the particle and hardens, somewhat like a pearl forming in an oyster. Since catching foreign particles is one of the main functions of nasal mucus, the presence of rhinoliths is a good indicator of a properly functioning nose (as opposed to a "runny nose", which can indicate illness). Bwahahahahahahahahaha!