The Left Angle Cross of Prevention is named for Gate 10 and Gate 15, both seated in the G, or Identity, centre. Human Design reads Gate 10, from Hexagram 10, Treading, as conduct that stays true to one's own nature rather than to expectation, and Gate 15, from Hexagram 15, Modesty, as a love of humanity broad enough to embrace extremes, with no fixed rhythm of its own. It falls in the Left Angle family, which practitioners read as transpersonal, a direction answering less to what the individual chooses than to what circumstance hands back, which is where the cross's name of prevention is read from.
Its design half, carried unconsciously, is Gate 18 and Gate 17. Gate 18 sits in the Spleen and is read as a corrective instinct, an alertness to what is flawed and could be set right; elsewhere it pairs with Gate 58 in the channel of Judgment. Gate 17 sits in the Ajna and is read as the forming of opinions, logical viewpoints seeking to be organised and offered to others; it pairs with Gate 62 in the channel of Acceptance.
So a chart carrying this cross holds an Identity centre pair of self-regard and tolerance on the surface, while beneath it a splenic instinct for correction answers to a mind still shaping its opinions. The hexagrams are ancient texts; reading four of them together as one transpersonal cross is the modern system's own construction, dated to 1987.