The following image shows the basic layout of the episodic formula:
the episodic formula
The text in red is boilerplate, generally found in most instances of the episodic formula. The text in blue represents a small set (three?) of possible non-numeric values, and the text in green is a number.
I propose that these formulae contain a scriptural reference, with the text in blue being the name of a book (usually one of the gospels) and the numbers in green being a specific chapter of the book.
Delia Huegel identifies the following as a depiction of Doubting Thomas:
The episodic formula that accompanies this picture contains the number 22. Interestingly, it looks like it is meant to be read "two and twenty", since the lower-order 2 comes before the higher-order 20. However, there are a number of strange things that happen with the numbers in these formulae, so they will definitely bear further examination.
The three main (or perhaps only) "books" mentioned in the episodic formulae are these:
Note that each of these begins with a crossed character, like the character for "nine" in reverse. Following my theory that the crossed line indicates a ligature with t, I suggest that this character represents some cognate of the word saint, which is common (I think) to all of the candidate languages.
If these are the names of three of the gospels, one possibility would be that the last two are Luke and Mark (in some order) because they both end with the same triangle character, and the first is John, because it does not share an initial with Mark (and so therefore is not Matthew).
If so, then I might need to scrap the theory I put forward in my last post suggesting that the triangle and circle represented the word for "day".