You cannot. You can only write it in your head.
Anthony Head is left handed.
The hogs head turned and starred at me.
Why you want to be Head Girl.
to write a letter you have to have a head body and ending just like your body
A write head is the part of an electromechanical device which converts electrical signals into digital or analogue information stored on a magnetic or optical medium.
You can not write a novel by keeping your creative juices in your head. Also, you can not write a novel by writing a dictionary instead.