The most convenient & succinct reference for scribal abbreviation is the book, meticulously-titled, “The elements of abbreviation in medieval Latin paleography,” and you may view an open access copy here:
https://kuscholarworks.ku.edu/handle/1808/1821
where you may also download a pdf of said book, if it so pleases.
#Eugepae! #MedievalLatin #paleography #scribalAbbreviation