Your Incarnation Cross is the four-gate combination formed by your Personality Sun, Personality Earth, Design Sun, and Design Earth. Among Human Design's many definitions, the Cross is widely considered the highest expression of your life purpose.
Short answer
Your Incarnation Cross is the four-gate combination formed by your Personality Sun, Personality Earth, Design Sun, and Design Earth. Among Human Design's many definitions, the Cross is widely considered the highest expression of your life purpose.
In depth
There are 192 possible Incarnation Crosses, organized into 4 quarters of 48 each. Each cross is named after the theme of its four-gate combination — for example, "The Right Angle Cross of Service" or "The Juxtaposition Cross of Self-Provocation".
The four gates of your cross frame your life's narrative. Personality Sun + Earth (the conscious mind, ~16% of total chart) describe how you experience your purpose. Design Sun + Earth (the unconscious body, ~28% of total chart, computed ~88 days before birth) describe how others experience your purpose.
The Cross unfolds through life — Ra Uru Hu taught that most people don't fully embody their cross until their late 30s or 40s, after they have experimented with their Type and Authority long enough to drop conditioning. Reading the cross too early in deconditioning can feel grandiose or abstract; it crystallizes through lived alignment.