I'm a bit surprised that noone mentioned KOMA-Script's footref before. The KOMA-Script manual also has an example where multiple reference to the same footnote could make sense:
Maybe you have to mark each trade name with a footnote which states that it is a registered trade name.
One could think of other similar cases…
documentclass{scrartcl}
begin{document}
Company SplishSplashfootnote{This is a registered trade name.
All rights are reserved.label{refnote}}
produces not only SplishPlumpfootref{refnote}
but also SplishPlashfootref{refnote}.
end{document}
问 如何在文章多个地方使用同一个脚注？