Grimoire
Grimoire is a book of witchcraft or paranormal magic. The word is pronounced "grim-warr", which rhymes with "guitar".
The word is a mistaken way of saying grammar. It probably started being used in a time when not many people could read. Then any book might be thought to contain instructions for magic.
In the religion of Wicca and other forms of Neopaganism, such a book is sometimes called a "Book of Shadows".
Grimoire Media
Page from the Greek Magical Papyri, a grimoire of antiquity.
An excerpt from Sefer Raziel HaMalakh, featuring magical sigils (or סגולות, seguloth, in Hebrew).
A man inscribed in a pentagram, from Heinrich Cornelius Agrippa's De Occulta Philosophia (Eng., Three Books of Occult Philosophy). The signs on the perimeter are astrological.