Three plates (Sancai)(in Chinese: 三才）for zwds palace
For example: Life Spouse (which is Heaven), Decade Silbing (which is Earth), and Year (the age of 24) (which is Man) — all in one location of Hai with Self Si-Hua. Meaning: at the age of 24, I will related with marriage (“Heaven – Man” in one), and my brother/sister will introduce the partner to me (Earth is the “media”).
Flying Star Zi Wei Dou Shu 