Om Dum Durgayei Namaha -

You will often see this mantra written as However, the more classical Sanskrit version is "Om Dum Durgayai Namaha" (with an "ai" instead of "ei"). The "ei" spelling is a common phonetic variation, especially in transliterations from Bengali and other North Indian languages, but the meaning remains identical. Both are widely accepted.

In summary, is a call to the divine mother for protection and courage. It reminds you that the power to overcome any difficulty lies not outside, but within—and Durga is the name for that indomitable, compassionate strength. om dum durgayei namaha