What does Taoist True Yang refer to?

Taoist True Yang refers to the "innate Qi", which is the reserve of the human body's warehouse.

To be specific, wood, for example, has shape and weight, and is of yin quality. This is true yin. But what it contains inside is the energy of the sun accumulated through years of photosynthesis, which is true Yang. When wood burns, it is the divergence of the accumulated solar energy, that is, the divergence of true Yang. When wood burns to ashes, its shape and weight disappear. That is to say, when the true yin is dissipated, the true yang will naturally disappear. When the true yang disappears, the true yin will not arise - this is the evidence of "the mutual root of yin and yang".