The word Shen is pronounced shēn, which is homophonic with the body, meaning vigorous. Judging from the font structure of this word, the fire burns on the wood, while the three fires mean that it burns violently, so it expresses the meaning of strong and prosperous wood.
There is a word "Shen" in Xu Shen's Shuo Wen Jie Zi in the Eastern Han Dynasty, and its annotation is "Shen, sound and appearance". From the perspective of Shen to wood, this sentence can be understood as referring to the prosperous appearance, and from the perspective of Shen to wood, it is a word.
Shen is actually a very old Chinese character, which mostly appears in the form of a name in our daily life, especially for some people who are short of five elements of fire wood. Old people in the family usually take the radical "Shen" with the meaning of "fire" or other Chinese characters indicating the prosperity of fire as their names to make up.