character meaning angle A-Z A-Z 0/90 deg a-z a-z 180/270 deg 0-9 0-9 0/90 deg - - 0/90 deg + - 180/270 deg ( ( 0/90 deg ) ( 180/270 deg . . 0/90 deg , , 0/90 deg : : 0/90 deg ; ; 0/90 deg " " 0/90 deg ' ' 180/270 deg _ space space null char