@MartinSleziak Not the first time I used it, though. One dupehammered question was deleted by owner. Another was reopened. On a couple of occasions I contributed the 5th vote to close; the badge symbol was recorded but no special powers used. (Except that it's possible to ping the user with dupehammer, unlike the regular close voters.)
closemath.stackexchange.com/q/411984/23353 No-effort and slightly unclear question; no answers have been upvoted. I also think that the question was mis-transcribed from plaintext to MathJax ($2^{n+n!}$ vs $2^n +n!$).