Module Codes
Except for a few early limited edition modules, all Dungeons & Dragons modules up until late 1994 were denoted with an alphanumeric code consisting of a letter and a number. The letter codes were based in some way on the product, with the number following the letter designating what number the product was in the series. Modules within a letter set were usually somehow related, either thematically or as a series of linked adventures. For example, Z1 may be a prologue to Z2. Or Z1, Z2 and Z3 may have the adventurers fighting a similar enemy such as beholders. Though related, most modules were stand-alone and could be played without playing any of the other related modules.
TSR also used the module coding system on modules for several of non-Dungeons & Dragons roleplaying games including modules for (Advanced) Marvel Super-Heroes and the Conan Roleplaying Game. The module code was de-emphasised in the late 1980s, which also saw the campaign setting logo become a main feature of the cover. The code was dropped altogether by the end of 1993. In 2008, the adventure code was reintroduced with the release of the 4th edition Dungeons & Dragons adventure: H1 Keep on the Shadowfell.
Read more about this topic: Adventure (Dungeons & Dragons)
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“We must trust infinitely to the beneficent necessity which shines through all laws. Human nature expresses itself in them as characteristically as in statues, or songs, or railroads, and an abstract of the codes of nations would be an abstract of the common conscience.”
—Ralph Waldo Emerson (1803–1882)