Book of shadows
A Book Of Shadows is what some practitioners of ritual magic call the journal they use to record rituals and spells, and their results, and other magical information. Both individuals and covens keep such books. It used to be the tradition that the record be in the handwriting of its owner, but these days the book is frequently replaced by a "Disk of Shadows" or a web site.
External links
Book Of Shadows in the Internet Sacred Texts Archive
The Gardnerian Book Of Shadows
See also
And in the movie world:
It is also the sequel to the movie The Blair Witch Project.