Once I have created a tag, but I have forgotten which tag it was. How do I find out which one it is? So that at least I can use that tag in my question.
Update: based on this SEDE query I just created, it's likely to be siegel-modular-forms — which you just added to 52 questions. I'm not sure if this is appropriate behaviour. Are you absolutely sure the tag is appropriate for all of those questions?
I somehow suspect that you are talking about the tag siegel-modular-forms.
I'm sure you honestly thought this to be a service to the community, and, as the software allowed you to create one, you may be a bit surprised by what feedback you get here ....... But, the way our culture has evolved over the years is that nowadays, more or less normatively, new tags should be cleared and discussed in a meta thread dedicated for that very purpose.
- Your tag may be defensible, at least it's a good enough idea to warrant serious consideration. But, please plead the case in meta before creating new tags. I think you can make a reasonable case, and the suggestion will be taken seriously. Not the least because you seem to have created an informative tag wiki.
- More often than not a new tag is created by an eager noob hunting for a taxonomist badge. Because such a user typically A) doesn't know much math, and B) has not familiarized themselves with our tagging system, such tags are usually abysmal, and removing them is a lot of work. Therefore our knee-jerk reaction to a new tag out of the blue is "Oh, no. Another one of those."
- If you create a tag for the purposes of earning a taxonomist badge, and add the tag anywhere it might fit, then ... you deserve all the heat you are gonna get. Earning such a badge is meant to take time. Just create a tag, and wait. If it is good enough others will begin to use it as well, and then you get your badge. Getting a badge in the old-fashioned way of earning it (as opposed to clicking "edit" 50 times) feels much better!
Taking off my moderator hat and donning a dictator's outfit instead:
- If I only could, I would forbid creation of new tags by means other than group clearance in meta.
- I would most certainly forbid anyone not yet in (or out of) grad school from creating a new tag simply because such people don't know much math at all.
- Actually I would also forbid people out of grad school from creating new tags unless they have cleared it in meta. This applies to myself as well as most of the others. I have not paid that much attention to what makes our tagging system work as well as it does, so I don't trust my own judgement (but I often need to deal with the consequences of a misguidedly created tag).
- This is IMNSHO a job for veterans of the site. But, they are actually a bunch of reasonable folks! It's not like they would steal your good ideas for new tags. They have spent a lot of time making it work, and will gladly elaborate on their objections (if any).