As noted above, we have a history tag and a history-of-terminology tag. These seem a little redundant, given the name of the site. I just re-tagged a question from history to history-of-terminology, but a terminology tag would be much better. What are your thoughts on the first two tags?
On could make a case that "history-of-terminology" is for questions of the historical development of terminology or old terminology while "terminology" would be about current terminology, and could be used in questions that concern history of science as a current discipline.
However, making such fine distinctions is not very useful in my opinion. Mainly, since in practice it is hard enough to maintain some basic standards of tagging throughout the site, and subtle distinctions worked out in theory can all too rapidly be blurred beyond recognition by imprecise usage in practice.
I am in favor of having one tag "terminology" for all things terminology. At least for now. Once we have 20 or 30 question with it, we might check if we want to split the tag.
The tag "history" is way too broad, I agree. I think we might even ask for it to be an intrinsic tag of the site. This would mean it cannot be created, but is accepted when questions are migrated here (which is not yet relevant though).
history is indeed a bit silly for this site. Makes about as much sense as programming on Stack Overflow or games on Arqade. We usually automatically blacklist tags corresponding to the site's topic, but in this case the system happily threw down a ban on hsm, which was... not optimal. In any case, history is manually blacklisted now.
Actually, any tag even containing the word "history" is now blacklisted, which means that history-of-terminology is off the table as well. Fortunately, it seems like using terminology as a catchall is working out just fine in practice. If it becomes a problem in the future, just bring it up here on meta.
Now it is time for someone with rep greater than or equal to 1250 (and other requisite requirements) to create the tag synonym for this situation. While one could go in and just replace all of these examples with the appropriate tag, and let the tag with the redundant "history" fragment just go away, it would be most appropriate for someone with the required rep to just use the tag synonym power now and make (history-of-terminology) simply (terminology). I see no actual arguments or digress from other community members.