Reading from left to right the syllables are:
Om (ohm), Ma (mah), Ni (nee), Pad (pahd), Me (may), Hum (hum)
Each of the 6 syllables has certain Sanskrit meanings that are important.
These oppose certain internal forces that cause suffering.
Om (ohm)- Om is the sound or “vibration” of the universe. This sound is the most important of all; but in the context of chanting and mantras, it is meant destroy attachments to ego and establish generosity.
Ma (mah)- Removes the attachment to jealousy and establishes ethics.
Ni (nee)- Removes the attachment to desire and establishes patience.
Pad (pahd)- Removes the attachment to prejudice and establishes perseverance.
Me (meh)- Removes the attachment to possessiveness and establishes concentration.
Hum (hum)- Removes the attachment to hatred and establishes wisdom.
“So in this way recitation of the mantra helps achieve perfection in the six practices from generosity to wisdom.