Maha Bodhi (Pipal) Tree
The Buddha attained His Enlightenment under this Bodhi Tree
on the full-moon day of Vaisatha (Wesak), 623 B.C.

OM

Buddha's Birthdate is April 8th, 563 B.C.

Aum Mani Padmé Hum or Om Mani Padmé Hung or Om Mani Peme Hung
meaning
"The All is a precious jewel in the lotus flower which blooms in my heart". (92k .wav file)

In the Chandogya Upanishad it is said:
The essence of all beings is the earth.
The essence of the earth is water.
The essence of water is the plant.
The essence of the plant is man.
The essence of man is speech.
The essence of speech is the Rigveda.
The essence of Rigveda is the Samveda.
The essence of Samveda is OM.
Thus OM is the best of all essences, deserving the highest place. (OM by Nitin Kumar)

Om Gate Gate Paragate, Parasamgate, Bodhi Svaha
meaning (depending on the translation):
"Om Beyond, Beyond, the Great Beyond, Beyond that Beyond, to Thee Homage" or
"Om gone, gone, gone beyond, gone completely beyond; praise to enlightenment" or
"Om Beyond, beyond, totally beyond, perfectly beyond: Awakening ....Yes!".