sql_special_char

sql_special_char 
      ::= 
      space 
      | double_quote 
      | percent 
      | ampersand 
      | quote 
      | left_paren 
      | right_paren 
      | asterisk 
      | plus_sign 
      | comma 
      | minus_sign 
      | period 
      | solidus 
      | colon 
      | semicolon 
      | less_than_op 
      | equals_op 
      | greater_than_op 
      | question_mark 
      | underscore 
      | vertical_bar 

This rule is called by

-> delimiter_token
-> sql_language_char