"Om Mani Padme Hum" is variously translated. What it means to you depends upon what you want it to mean.
It roughly means "The Jewel is in the Lotus of the Heart."
Om ma ni pad me hum is an important mantra in Buddhism. It is the six syllable mantra of Avalokiteshvara - the Bodhisattva of compassion. The Dalai Lama is said to be an incarnation of Avalokiteshvara, so the mantra is revered by his followers.
* Om purifies bliss and pride (the realm of gods)
* Ma purifies jealousy (the realm of jealous gods)
* Ni purifies passion and desire (the human realm)
* Pad purifies ignorance and prejudice (the animal realm)
* Me purifies poverty and possessiveness (the realm of the hungry ghosts)
* Hum purifies aggression and hatred (the realm of hell)
It is often found written on antique Swastikas.
The word Swastika is Sanskrit: su, meaning well, and asti, meaning to be. (Be well.)