abracadabra

This charm was used throughout the Middle Ages. 'One only had to write it down in the triangular pattern shown below and wear it round one's neck as a sort of phylactery or charm to be protected from various diseases and to be cured of fever':

ABRACADABRA

ABRACADABR

ABRACADAB

ABRACADA

ABRACAD

ABRACA

ABRAC

ABRA

ABR

AB

A

The word derives from the Hebrew abreg ad habra meaning to 'strike dead with thy lightning.' In Hebrew it comprises nine letters. 'Placing aleph on the left side of the triangle - and its ninefold repetition - is the magical element.' By arranging the letters in a reverse triangle, the celestial energies which the charm claims to entrap are directed downwards. According, the figure should be seen three-dimensionally as a funnel. Like amulets, talismans and pentacles, this charm seeks to give the individual a sense of protection through communication with the higher powers and with the mysterious laws which govern the universe.


from THE PENGUIN DICTIONARY OF SYMBOLS

found via http://www.jonathancarroll.com/