Problems with 'null' symbol

'||
NIL
':||
;;; An error
occurred in function CREATE-SYMBOL-FROM-CHARS:
;;; Error: Invalid symbol--no characters after package marker
 
'user::||
;;; An error
occurred in function CREATE-SYMBOL-FROM-CHARS:
;;; Error: Invalid symbol--no characters after package marker
 
(describe '||)
;;; Autoloading
C:\PROGRAM FILES\CORMAN TECHNOLOGIES\CORMAN LISP 2.01\sys\describe.lisp
...
SYMBOL:
   
name:          
NIL
   
value:          NIL
    package:       
#<PACKAGE "COMMON-LISP">
    property list:  (COMMON-LISP::TYPE-DISCRIMINATOR
#< COMPILED-FUNCTION: #x192EEB0 >)
    function:       #<
UNBOUND >
    function type:  NIL
    constant:       T
    special:       
NIL
    jump table:     0
    variable table: 0
    heap address:   #x1710000
(setq x '||)
NIL
(symbol-name x)
"NIL"
(symbol-name nil)
"NIL"

;;;; Allegro:

> '||
||
> 'user::||
>
COMMON-LISP-USER::||
> 

> (describe '||)
|| is a SYMBOL.
  It is unbound.
  It is INTERNAL in the COMMON-GRAPHICS-USER package.

> (setq x '||)
||
> (symbol-name x)
""
 





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