Daēnā (Avestan pronunciation: [dʌeːnaː]) is a Zoroastrian concept representing insight and revelation, hence "conscience" or "religion."
In Zoroastrianism: An Introduction to an Ancient Faith, Peter Clark suggests that the term might also be tied to the Avestan root "deh" or "di-" to gain understanding.
[8] Maneckji Nusserwanji Dhalla writes in Zoroastrian Theology that on the dawn of the fourth day after death, "there appears then to the soul its own daena, or religious conscience in the shape of a damsel of unsurpassed beauty, the fairest of the fair in the world.
Daena has been used to mean religion, faith, law, even as a translation for the Hindu and Buddhist term Dharma, often interpreted as "duty" or social order, right conduct, or virtue.
The metaphor of the 'path' of Daena is represented in Zoroastrianism by the muslin sedreh undershirt, the "Good/Holy Path", and the 72-thread Kushti girdle, the "Pathfinder".