The Left Angle Cross of Alignment is named for Gate 28 and Gate 27. Human Design reads Gate 28, from Hexagram 28, Great Preponderance, sits in the Spleen and is read as the search for something worth risking a life for; and Gate 27, from Hexagram 27, Nourishment, sits in the Sacral centre and is read as the instinct to feed, protect and take responsibility for others. It falls in the Left Angle family, which practitioners read as fated in flavour, serving something beyond the individual rather than a self chosen plan.
Its design half is Gate 33 and Gate 19, the same two gates the Right Angle Cross of the Four Ways carries in reverse. Gate 33 sits in the Throat and is read as the need to withdraw and hold an experience privately before telling it; it pairs with Gate 13 in the channel of the Prodigal. Gate 19 sits in the Root and is read as sensitivity to what a community needs, materially and physically; it pairs with Gate 49 in the channel of Synthesis.
So a chart carrying this cross risks itself for a worthy purpose while caring for others on the surface, while beneath it a private retreat answers to a Root sensitivity toward communal need. The numbers are inherited from the I Ching; reading them as one cross belongs to the modern reading, not the classical one.