شب قدر: Night of Power

Laylat al-Qadr , loaned from Persian,

 variously rendered in English as the Night of Destiny

, Night of Power, Night of Value, the Night of Decree
  

 or Night of Measures.
Laylat al-Qadr is believed to be the

night when the Quran was first revealed.


http://en.wikipedia.org/wiki/Laylat_al-Qadr

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Laylat al-Qadr — the Night of Power — commemorates the night during which the first verses of the Holy Qur’an were revealed to Prophet Muhammad (peace be upon him and his family). The Holy Qur’an describes Laylat al-Qadr in Surah 97:

We have indeed revealed this (Message) in the Night of Power. And what will explain to thee what the night of power is? The Night of Power is better than a thousand months. Therein come down the angels and the Spirit by Allah's permission, on every errand. Peace! This until the rise of morn!

http://www.theismaili.org/cms/793/Laylat-alQadr