1. The five elements of the character Hao belong to fire. The word Hao itself has a very auspicious meaning, representing broad-mindedness, cheerfulness, handsomeness, etc.
2. The taboo of naming with the word Hao. The five elements refer to the movement and changes of the five substances: wood, fire, earth, metal, and water. Mutual generation means "wood generates fire, fire generates earth, earth generates metal, metal generates water, water generates wood", and mutual restraint means "metal restrains wood, wood restrains earth, earth restrains water, water restrains fire, and fire restrains metal." (The five elements of the character Hao belong to fire, so avoid using characters for metal and water).