A pulse-sticker was a sticker that glowed rhythmically. At Rimsoo units, doctors and nurses attached pulse-stickers to patients during triage to categorize the severity of patients injuries and their chances of survival. The stickers were numbered from 1 to 6 as well as a red "X" sticker attached to patients who had virtually no chance of survival and were deemed untreatable. Rimsoo units also used pulse-stickers of various colors on patients beds to help organize them.