ESC 27 Introduce a control sequence. All characters less than 32 decimal which are not listed above are ignored. Pn refers to a number whose value used directly. Ps refers to a number used as a selector. The following is a list of the available styles of printing on the screen.
Line designates underlining.
Blink is for blinking characters. Side is the orientation of the character. Normal means that there is no orientation. Top and bottom refers to the position of the character in order to make a complete character. The top and bottom sequences will be important if you use the double height option.