Exact(1)
If you need to use an omitted letter (such as the "J" in the Polybius square above), you can simply use the coordinates of one of the adjacent letters (either "I" or "K"), as there will rarely be any confusion.
Similar(7)
The apostrophe, though, is common but random.Its use for omitted letters is ancient.
Crystal rebuffed these drastic claims: the supposed "innovations" of texting, he notes — abbreviations, omitted letters, ideograms, nonstandard spellings — have been features of the language for centuries.
His trademark techniques of interchanging and cutting up words and omitting letters and syllables received mixed reviews.
The model envisions a message source — an idealized user with clear intentions — passing through a noisy channel that introduces typos by omitting letters, reversing letters or inserting letters.
Interestingly, patients with neglect tend to omit letters presented on the left side of the mental representation line, revealing the same rightward bias in the letter bisection tasks as in the physical line bisection tasks [16].
We used a closed set of responses, the digits 1 9, omitting letters and words sometimes used in the test.
On typing this song title, I absent-mindedly omitted a letter.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com