See combination (113 threads). Some of these are combinatorics questions about counting combinations, some are about linear combinations, combining distributions, combining this, combining that... The tag has no wiki. I don't think this tag is very useful in any of its meanings.
Proposed way forward
- Those Qs that are about combinatorics should be retagged [combinatorics] or if both tags are present, the [combination] tag simply deleted. I don't think it is relevant to separate combinatorics questions that are about "combinations" from other combinatorics questions by tags.
- In other cases, the tag [combination] should on a case-by-case basis be either just deleted or retagged to something more descriptive if there is something tag-worthy, say, [combining-forecasts].