Dao literally means way, road or path – the actual meaning goes far beyond these terms. Dào stands for absolute integrity, the wholeness, the unity before even Yin and Yang manifested. The concept of Dao is comprehensive and assumes both the dual space of the material world as well as the transcendent space beyond that duality.
> Usage of the symbol
You can place the characters Dao anywhere –as it finally defines the wholeness. It describes and enhances energy and existence on a fundamental all including level and can be very powerful. The most effective place might be the center of your home (Bagua n° 5) or near by a house altar.