Kor'tova candle
From Memory Alpha, the free Star Trek reference.
A lit kor'tova candle represents the fire that burns in a Klingon warrior's heart.
Before the age of thirteen, a Klingon child has to light its own kor'tova candle from the candle of another Klingon, thereby declaring its intention to become a warrior. If the young Klingon does not participate in the rite before turning thirteen, he or she will never be able to become a true Klingon warrior. (TNG: "Firstborn")
