Praying for Peace

The Om Shanti Mantra
Om shaanti shaanti shaanti
Like many mantras, this one begins with "Om". Om has no meaning, and
its origins are lost in the mists of time. Om is considered to be the
primeval sound, the sound of the universe, the sound from which all
other sounds are formed. You could regard it as being the equivalent
of white light, in which all of the colors of the rainbow can be
found. One Sanskrit-English dictionary says the following:
"A word of solemn affirmation and respectful assent , sometimes
translated by 'yes , verily , so be it' (and in this sense compared
with Amen ; it is placed at the commencement of most Hindu works , and
as a sacred exclamation may be uttered at the beginning and end of a
reading of the Vedas or previously to any prayer ; it is also regarded
as a particle of auspicious salutation [Hail!] ; Om appears first in
the Upanishads as a mystic monosyllable , and is there set forth as
the object of profound religious meditation , the highest spiritual
efficacy being attributed not only to the whole word but also to the
three sounds A, U, M, of which it consists. "
Shanti simply means "peace". It's a beautiful meaning and also a very
beautiful sound. The shanti is repeated three times, as are many
chants in Buddhism. You could interpret this as meaning peace in body,
speech, and mind (i.e. in the entirety of one's being), or as a wish
for peace individually, collectively, and universally.
Hindu teachings typically end with the words Om shanti shanti shanti
as an invocation of peace, and the mantra is also used to conclude
some Buddhist devotional ceremonies.
Pronunciation notes:
o is pronounced like o in ore
aa is pronounced as a in father
i in speech is pronounced like i in mill, but in chanting is
pronounced like ee in bee
from
http://www.wildmind.org/meditation/mantra/shanti.html
Dona nobis pacem; grant us peace.