Variable: print-escape-control-characters
print-escape-control-characters is a variable defined in print.c.
Value
nil
Documentation
Non-nil means print control characters in strings as \OOO.
(OOO is the octal representation of the character code.)
Probably introduced at or before Emacs version 26.1.
Source Code
// Defined in /usr/src/emacs/src/print.c
DEFVAR_BOOL ("print-escape-control-characters", print_escape_control_characters,
doc: /* Non-nil means print control characters in strings as `\\OOO'.
\(OOO is the octal representation of the character code.)*