Null

Written as the unquoted text null, this value represents nothing.

This may correlate to a languages' null value, or represent the absence of a value in languages which do not have a null type. In some languages this may be best represented by 0 or an empty list ('()) as in some lisp style languages.

nothing = null;

It is at the discretion of the implementer to decide what makes the most sense for their use case and the capabilities of their language.

As described in booleans, null is able to be used as an identifier, though highly discouraged.