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In all LaTeX packages documentations that show their internal codes, we see \@ and often we see \@@ or even \@@@. What is the difference between \ and \@? What does it mean to write more @ to start a control sequence or instruction?

Al-Motasem Aldaoudeyeh
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  • For example https://tex.stackexchange.com/questions/8351/what-do-makeatletter-and-makeatother-do, https://tex.stackexchange.com/questions/106253/naming-conventions-for-macro-names-that-include-the-package-name, https://tex.stackexchange.com/questions/106174/makeatletter-explained: the @ is used as an extra 'letter' for internal macro names, beyond that there is not much pattern (except \@@<name> is used by the kernel to save primitives). – Joseph Wright Aug 30 '18 at 18:35
  • Or some more answers at https://tex.stackexchange.com/questions/11078/what-is-the-difference-between-myname-and-myname-while-writing-a-cls-file – Marijn Aug 30 '18 at 18:38

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