Each sign is divided into twelve parts measuring two and a half degrees each; reckoned beginning from that very sign itself, this division is called the Dvadasamsha (D12).
Verse 3 — Strength of the Dvadasamsha Lord and Fortune of the Lineage
When the lord of the Dvadasamsha is strong and conjoined with benefic planets, it indicates well-being of the father and mother and the increase of the lineage.