Number of years Enosh lived after he had a son named Kenan (Gen 5:10). The number has no well-established independent symbolic meaning beyond this occurrence.
The number 815 appears in the Bible's genealogy in Genesis 5:10, where it is told that Enosh lived eight hundred and fifteen years after he had a son named Kenan, and that he had more sons and daughters. Enosh is the third generation from Adam, son of Seth, and his name is linked to humanity in a broad sense. The long lifespans in the patriarchal genealogy in Genesis 5 express a theological understanding of mankind's original vitality in the early days of creation. Although the number 815 is not assigned an independent symbolic role like numbers such as 7, 12 or 40, it testifies to the biblical tradition where God's blessing of long life marks the continuity of the lineage from Adam through the early patriarchs. The name Enosh (אֱנוֹשׁ) is related to the Hebrew word for 'human' or 'mankind,' and is used several times in the Old Testament as a poetic term for humanity in its frailty (cf. Ps 8:5). According to Gen 4:26, it was during Enosh's time that people began to call on the name of the Lord, which in rabbinic tradition has been interpreted both positively (as the beginning of organized worship) and negatively (as the start of idolatry). The extremely high ages recorded in Gen 5 have parallels in Sumerian king lists, where rulers before the great flood are credited with even longer reigns, suggesting a shared Mesopotamian tradition for portraying primeval times as an era of superhuman vitality.*