6.1.0 1
6.1.0 2
\nil\ is a \term{symbol} which appears to be treated as a variable when evaluated.
To modify the value of \nil\ is not permitted.
The value of the object \oftype{null} is \nil.
\nil\ represents both the
logical false value and the \term{empty list}.
14.0.0 3
\nil\ is considered to be a \term{sequence} of length zero.