Choose a convention and stick to it. The most universally accepted format is: Series Name Issue Number (Year) (Source) (Group Tag)
To understand the ID, one must understand the history. In the early 2000s, before Marvel Unlimited and ComiXology, the only way to read back issues digitally was to scan physical copies. Enthusiasts formed groups—EVIL-DEVIL, DCP, Zone-Empire, Minutemen—each with proprietary standards. comicscan id