Has anyone heard of Om Mani Padmi Hum?

I've read of a Buddhist mantra (Tibetan, I think) called "Om Mani Padmi Hum," and I was wondering if it's used in Japan?

I'm told all six syllables have a specific meaning (such as "om" meaning wisdom, "ma" compassion, "ni" speech," etc), is that true?

Om Mani Padme Hum is only used in Tibetan Buddhism as far as I know. The Wikipedia page has a good explanation of the meaning of the syllables: http://en.wikipedia.org/wiki/Om_mani_padme_hum

Padme means lotus, and there is a Lotus Sutra which is used in Japanese Buddhism, Namu Myoho Renge-Kyo. You can read about it here: http://en.wikipedia.org/wiki/Lotus_Sutra

Thank you.

Has anyone heard of On Mani Hatsumei Un?

What does it mean?

Are the syllables believed to have meaning?

If it's a Buddhist mantra that called 真言(shingon) in Japanese,
it is transliterated Sanskrit words with Japanese letters and has no meaning in Japanese.

I often see shingons in temples especially in front of Buddhist statues.
They say like オン アミリタ テイセイ カラ ウン "On Amirita Teisei Kara Un" or something.
It's all Greek.