One of the peculiarities of the epigraphic profession is the use of arcane abbreviations and acronyms for the various publications. You can find a number of commonly uses systems below.
AIEGL, the International Association for Greek and Latin Epigraphy issued in 2020 a new comprehensive list of abbreviations that will be used in both SEG and BE. This is now expected to become the new standard: https://www.aiegl.org/grepiabbr.html.
Previous lists may be found at the folloing places:
The Guide de l'Épigraphiste has a list of abbreviations, available also as a downloadable PDF.
Claros/DGE has an extensive list on-line.
Epigraphische Datenbank Manfred Clauss has a list that includes Latin inscriptions.
Authoritative lists of abbrevations for general Classics or Archaeology journals can be found e.g. in L'Année Philologique, (for a PDF click here) the American Journal of Archaeology or the DAI Archäologische Bibliographie.