I noticed that the tag for Original D&D is "odd." Will people realize that this is for OD&D? Will there be confusion with odd/strange?
I think this another point in favor of retagging the D&D-related things as "dnd" and so on.
We make sure there's useful information in the tag wiki! [odd] has a good one, which is nice.
When it's unclear what the meaning of the tag is, but there's one clearly superior use, I think the wiki is enough. But there are systems named "Adventure!" "Warlord," "Wushu," "Bushido," "Wushu," and "Wild Talent," all of which could conceivably be used as tags for other things. "-" is already in use to combine two words into an atomic tag, and I think that should be the sole use for "-". When or if it becomes necessary, I think "." should be used to append disambiguations. [adventure.system] or [adventure.game] is still going to be confusing, but at least there would be an underlying logic capable of being discovered and explained.