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While compiling sources for my thesis, I noticed that in a *.bib file, the title was written using {{Insert title here}} and copied this in my *.tex file: \section{Recognizing {{Human Daily Activities From Accelerometer Signal}} ... }.

I wondered what it would do. After compiling, I saw no difference. Then, I tried using only a single curly brace, e.g., {Insert title here}, and this also showed no difference.

On documentation, I could not really find any ruling about this in LaTex. Does anyone know what they signify? Do they have something to do with non-breaking spaces? Line breaks?

Thanks :)

I only checked the results using my own two eyes. So maybe there is a difference in the pdf or the characters itself.

Neither the double nor the single brackets did anything for me.

Student CS
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  • Looks like markers that either another program or the author should replace – Robert Mar 15 '23 at 00:03
  • Cross-site duplicate [Different behavior of double curly braces from single curly braces and quotation marks in correction of letter cases](https://tex.stackexchange.com/q/294870/242828) – Brian61354270 Mar 15 '23 at 00:04
  • @Robert No, that's ordinary bibtex syntax. – Brian61354270 Mar 15 '23 at 00:04
  • Also https://tex.stackexchange.com/q/327386/242828, https://tex.stackexchange.com/q/109064/242828, https://tex.stackexchange.com/q/255343/242828, https://tex.stackexchange.com/q/629260/242828 – Brian61354270 Mar 15 '23 at 00:05
  • @Brian61354270, I think that your "Cross-site duplicate" provides answers to the *.bib case. I, however, have inserted the code in LaTex itself, trying to see what the characters mean in *.tex. I do not think that the cross-site URL answers that question? – Student CS Mar 15 '23 at 00:08
  • @StudentCS My bad, read your question too quickly. In LaTeX itself, double curly braces don't have special meaning; it's just single curly braces nested twice. As for what curly braces themselves mean, that's probably best answered in [What is a token?](https://tex.stackexchange.com/q/104023/242828) – Brian61354270 Mar 15 '23 at 00:14
  • @Brian61354270, that's exactly what I was looking for! Thank you. (I can accept your last comment as an answer and give you credit if you want to post it as an answer :) ) – Student CS Mar 15 '23 at 00:19

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Double curly braces don't have any special meaning in LaTeX; it's just single curly braces nested twice. As for what curly braces themselves mean, see

Brian61354270
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