41. List of Non-Alphanumeric Tokens

       
! $+$ $<$ [
% , $<=$ ]
& - $<>$ |
' . = ~
( / == ~=
) /! $>$ (space)
* // $>$= (return)
*! { ? `
** } @ :
; ^ |= &=
+= -= *= /=
**=  

Here is a list of the  non-alphanumeric tokens used in basis. Any input character other than one of these, which is not alphanumeric, will cause an ``illegal character in input'' error (unless, of course, it is part of a comment).