+ - * / \ ^ < > = ` ~ : . ? @ # &
'sofaki' '%' '_$op'If the single quote character is to be included in the sequence it must be written twice. For example:
'don''t' ''''
! ; [] {}Note that the bracket pairs are special. While '[]' and '' are atoms, '[', ']', '', and '' are not. Like Prolog, the form [X] is a special notation for lists (see Section 4.1.6), while the form X is just ``syntactic sugar'' for the term ''(X).
Examples of HiLog atoms are:
h foo ^=.. ::= 'I am also a HiLog atom' []