No Arguments or Values in The "Syntax" Section (ANSI and GNU Common Lisp Document)

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#### 1.4.4.29 No Arguments or Values in The "Syntax" Section

If no arguments are permitted, or no values are returned, a special notation is used to make this more visually apparent. For example,

`F` <no arguments> ⇒ <no values>

indicates that `F` is an operator that accepts no arguments and returns no values.