Tool to decode and encode Gravity Falls Theraprism cipher messages with symbols from The Book of Bill and Season 2 Episode 15: The Last Mabelcorn.
Gravity Falls Theraprism Cipher - dCode
Tag(s) : Symbol Substitution
dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!
In the book Gravity Falls: The Book of Bill, a series of 4 encrypted messages appear with symbols depicted in Season 2, Episode 15 (during a nightmare Ford has).
Theraprism is a neutral zone outside of time and space dedicated to the rehabilitation of deceased beings like Bill Cipher, who was sent there after his death to undergo compulsory therapy in preparation for possible reincarnation.
The Theraprism code contains 25 characters, replacing the first 25 letters of the alphabet (a priori, the Z does not exist, at least, it is not used) according to the table:
A | ![]() | B | ![]() | C | ![]() | D | ![]() | E | ![]() | F | ![]() | G | ![]() |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
H | ![]() | I | ![]() | J | ![]() | K | ![]() | L | ![]() | M | ![]() | N | ![]() |
O | ![]() | P | ![]() | Q | ![]() | R | ![]() | S | ![]() | T | ![]() | U | ![]() |
V | ![]() | W | ![]() | X | ![]() | Y | ![]() | ||||||
dCode.fr |
The other characters (number, punctuation or symbol) have no equivalent (at least, nothing is mentioned in the book).
The decoding of the symbols of Theraprism is based on a monoalphabetic substitution: each symbol corresponds to a single letter of the alphabet, from A to Y.
The Theraprism alphabet is a collection of symbols that does not seem to have any structure. Each symbol is unique, the shapes vary, some are geometric (circles, triangles, squares), others are small drawings (stars, arrows, etc.), others are based on lines and curves.
The book The Book of Bill and episode 15 (season 2) of Gravity Falls (The Last Mabelcorn, an episode with unicorns) seem to be the first appearances of the code.
dCode retains ownership of the "Gravity Falls Theraprism Cipher" source code. Any algorithm for the "Gravity Falls Theraprism Cipher" algorithm, applet or snippet or script (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or any "Gravity Falls Theraprism Cipher" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) or any database download or API access for "Gravity Falls Theraprism Cipher" or any other element are not public (except explicit open source licence like Creative Commons). Same with the download for offline use on PC, mobile, tablet, iPhone or Android app.
Reminder: dCode is an educational and teaching resource, accessible online for free and for everyone.
The content of the page "Gravity Falls Theraprism Cipher" and its results may be freely copied and reused, including for commercial purposes, provided that dCode.fr is cited as the source.
Exporting the results is free and can be done simply by clicking on the export icons ⤓ (.csv or .txt format) or ⧉ (copy and paste).
To cite dCode.fr on another website, use the link:
In a scientific article or book, the recommended bibliographic citation is: Gravity Falls Theraprism Cipher on dCode.fr [online website], retrieved on 2025-05-01,