Abracadabra
Abracadabra also Abrahadbra (unknown language)
1) a magical charm or talisman
2) a form of gibberish, used to give the impression of arcane knowledge or power.
3) a word said by magicians when performing a magic trick.
                              __________________________________________________________

                    Abracadabra is a word of unknown origin, used in stage magic tricks. Historically, it was believed to be an incan-tation having healing powers when inscribed on an amulet. Its first
occurrence is in the second century.. Several folk etymologies are associated with the word from phrases in Hebrew that mean "I will create as I speak", or to its similarity to the first four letters of the Greek alphabet (alpha-beta-gamma-delta or ΑΒΓΔ) According to authorities, "no documentation has been found to support any of the various conjectures.
    The first known mention of the word was in the second century AD in a book called Liber Medicinalis (sometimes known as De Medicina Praecepta Saluberrima) by Serenus Sammonicus, phys-ician to the Roman emperor Caracalla, who in chapter 51 pre-scribed that malaria sufferers wear an amulet containing the word written in the form of a triangle.
    The power of the amulet, he claimed, makes lethal diseases go away. Other Roman emperors, including Geta and Severus Alexander, were followers of the medical teachings of Serenus Sammonicus and may have used the incantation as well.  It was used as a magical formula by the Gnostics of the sect of Basil-ides in invoking the aid of beneficent spirits against disease and misfortune. It is found on Abraxas stones, which were worn as amulets. Subsequently, its use spread beyond the Gnostics. 		  
Abracadabra written as a magical triangle

    The Puritan minister Increase Mather dismissed the word as bereft of power. Daniel Defoe also wrote dismissively about Londoners who posted the word on their doorways to ward off sickness during the Great Plague of London.

    The word is now more commonly used as a magic word in the performance of stage magic. The word is one of a limited set of words that can be typed in its entirety using the left-handed side of a QWERTY keyboard.