texinfo: Inserting an Atsign

Special Characters

Inserting Braces

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14.1.1 Inserting '@' with '@@' and '@atchar{}'
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'@@' produces a single '@' character in the output.  Do not put braces
after an '@@' command.

  '@atchar{}' also produces a single '@' character in the output.  It
does need following braces, as usual for alphabetic commands.  In inline
conditionals (Note: Inline Conditionals), it can be necessary to avoid
using the literal '@' character in the source (and may be clearer in
other contexts).