Among the several historical and pseudo-historical scripts this atlas covers, Theban X belongs to the simplest family: it is a straight substitution for a single Latin letter, with none of the underlying Hebrew alphabet Celestial, Malachim and Passing the River recode, and none of the separate twenty-one-letter constructed language Enochian claims for itself, both discussed elsewhere in this atlas. That plainness has not stopped the script from spreading well beyond its Renaissance printing: modern Wiccan reference books, most influentially Scott Cunningham's widely read 1988 guide for solitary practitioners, reproduced a Theban chart as a practical private alphabet, and the script is now one of the most commonly seen ciphers in general pagan and occult-adjacent material, turning up in printed Book of Shadows templates, jewellery, tattoos and fantasy media alike, usually with little or no reference to Trithemius, Agrippa or the disputed Honorius attribution covered elsewhere in this atlas.
X itself carries none of that popularity as a distinct symbol in its own right, since every letter of the cipher is, and always has been, interchangeable with any other purely by its position in the Latin alphabet it silently stands in for. That interchangeability is worth stressing precisely because X, of all Latin letters, is the one most often used elsewhere as a generic placeholder or a marker of the unknown, a modern habit that has no bearing on this cipher, where X marks nothing more than the twenty-fourth ordinary letter of the alphabet.