worn as horns when worn as a crown or diadem, e.g. in depictions of the lunar goddess, or in the headdress of Persian kings, etc.

The word crescent is derived etymologically from the present participle of the Latin verb crescere "to grow", technically denoting the waxing moon luna crescens. As seen from the northern hemisphere, the waxing Moon tends to appear with its horns pointing towards the left, and conversely the waning Moon with its horns pointing