emacs for medieval scribes

in my handwritten notes I sometimes use the symbol to represent the word "that." this symbol comes from a long list of scribal abbreviations from ancient and medieval times, some of which are still commonly used (for example, "&"), but most of which have fallen into obscurity.

alas!
while there's an "&" key on my keyboard, there isn't an equivalent one for "Ꝥ." I fixed this by adding an emacs keybinding that inserts Ꝥ into the current buffer, and here's how I did it:
;; insert `Ꝥ', an old scribal abbreviation for `that'"
(defun that ()
 (interactive)
 (insert "Ꝥ"))

(global-set-key (kbd "C-\"") 'that)
the gist of this code is that it allows you to insert a Ꝥ into the current buffer by typing `C-"`.

that is all.