The tag units is clearly used ambiguously, and the tag does not offer the kind of benefit or support we usually associate with tags. Furthermore, it does not appear that any of the involved questions would suffer detriment to having the tag removed. We should definitely delete it.
In case others wish to have more information to make a decision, here is some information I was able to pool from the units wiki and listed questions:
- The tag is currently only being used on 20 different questions. This seems like a particularly small number to have a dedicated tag for, in the first place. Two of these questions have been closed, one for "not constructive", and one as a "duplicate".
- The interpretation of the tag appears to be roughly split down the middle. Half the questions appear to use the tag in regards to units of measurement, half the questions appear to use the tag in regards to ambiguous game units such as enemies or texture objects. There is no wiki excerpt detailing the intended use.
- Despite being created 4 years ago, there are currently only 2 views on the tag wiki, one of them being myself in response to this meta. It is clear, from this, that the this tag has not received any real support in regards to meta. Furthermore, there do not appear to be any users subscribed to this tag. Of the top users, I only note a single user who has answered more than one question with this tag, at a total count of 3.
- The tag is only used as a secondary tag. While it is somewhat clear (in most cases) what the askers intention was, in regards to using the tag on their question, the questions all feature more relevant tag that more accurately categorise the question. Not a single question categorises soley under the units tag.
I have previously been told that a good way to judge any possible benefit from a tag would be to determine whether somebody professionally adept with the subject would be more likely to provide good quality answers. Ultimately, I do not believe you can be a professional in regards to units of measurement or game units, as either topic is simply to ambiguous.