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set_name().
A name expression is simply a name token, an identifier or string
following a dollar sign ($).
When the interpreter encounters a name expression, it looks up the name
to see what dbref it has been assigned by the set_name()
function. If no such assignment has been made, then the interpreter
throws a ~namenf error; otherwise, the value of the name
expression is the dbref assigned to the name by set_name().
You can also use the (non-administrative) function get_name() to
look up a symbol as a name.
The administrative function del_name() deletes the association
for a name.