T Parting
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Start by parting off the hair at the back of the head from one side to the other at a point approximately one inch behind the ears. As you face the mirror with your head tilted slightly forward, this will have created a horizontal line across the scalp.
Complete the "T" by then parting the hair on top of the head along a center line. The hair of the head should now be divided into three equal sections. Twist the hair up and secure the sections with a butterfly clip to keep the hair out of the way until you are ready to work with that particular section.
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See also:
7-section parting
Star sectioning