The default value of LaTeX-section-label is:

(("part" . "part:")
 ("chapter" . "chap:")
 ("section" . "sec:")
 ("subsection" . "sec:")
 ("subsubsection" . "sec:"))

However, for chapter, when typing C-c C-s, we get cha instead of chap:.


If reftex is enabled and the variable reftex-plug-into-AUCTeX is not nil the value of LaTeX-section-labelis ignored and reftex-section-prefixes is used. Its default value is

((0 . "part:")
 (1 . "cha:")
 (t . "sec:"))

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