The Theban alphabet, also called the Honorian alphabet or the 'Witches' Alphabet', is a substitution cipher for the Latin alphabet rather than a language of its own. It first appears in print in Johannes Trithemius's Polygraphia (1518) and in Heinrich Cornelius Agrippa's Three Books of Occult Philosophy, and is traditionally attributed to the semi-legendary Honorius of Thebes. From the mid-twentieth century it was widely adopted in Wicca and modern witchcraft for writing privately in the Book of Shadows and for inscribing ritual tools. Because Theban is a one-to-one cipher of the Latin letters, this glyph simply stands for the Latin letter F and carries no phonetic, numerical or symbolic value of its own beyond that substitution; the letters I and J, and U, V and W, are commonly shared. Theban has no gematria and no per-letter mystical tradition. No writing in this script survives independently of Trithemius's own printing: he ascribed it to a legendary Honorius of Thebes, citing the medieval scholar Pietro d'Abano as his source, but no manuscript from Honorius's supposed hand or period has ever surfaced, and most historians of the cipher now judge it more likely that Trithemius himself, or a contemporary in the same German humanist milieu, devised the script and dressed it in a borrowed medieval pedigree.
Trithemius wrote as abbot first of Sponheim and then of a monastery near the Main, in a Rhineland world where cryptography and angel magic freely mixed; Agrippa's reproduction of the alphabet in 1533 is the only other early independent printing, and later copies descend from those two sources. Claims of a genuinely ancient, Celtic or druidic origin for Theban do not survive examination against this datable, printed record.