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11.1.1 Inserting ‘@’ with @@ and @atchar{}

@@ 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 (see Inline Conditionals: @inline, @inlineifelse, @inlineraw), it can be necessary to avoid using the literal ‘@’ character in the source (and may be clearer in other contexts).