Sharp, crisp.. I like it. Don't use the .jpg because the background is white. Doesn't look like a problem if your reading this but when you go into the post topic area you will clearly see the white edges.
Use the GIF.
Although, could you do a remake of the standard one (
)? I like the caution sign better than the radioactive symbol or whatever. It makes sense...
EDIT ~ On second thought, that one might be even harder to read. The characters are a bit too wide. Perhaps use a more narrow font?
The last one is .png. The transparency isn't supported or doesn't show in IE tho.
Well, I could make a radioactive sign if you want, a refurbished one. The thing is, the reason why it is hard to read the current one is because it is too narrow. I think the one I made is a little more... Readable.
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory