Thus, I was wandering what subjects is was meant to. Is it the delta wing (in which case it should be synonym of the delta-wing tag) or delta airline, or something else. Given the ambiguity, the description must be updated (or the tag removed) but to do it I must understand what subject the tag was made for.
The delta tag is currently only used for one question:
- What are the disadvantages of fitting underwing flaps to a Mirage III/5 fighter jets to lower landing speeds?
I don't think a tag synonym delta should be created because of the ambiguity mentioned in your question. delta-wing is much more descriptive and will automatically appear as a tag suggestion when typing "delta" in the tag field, which IMHO eliminates the need for a synonym.