The trigram that represents the wealth position in the Bagua is the Li Trigram. This trigram, also known as the Fire Trigram, is associated with the concept of wealth and prosperity in traditional Chinese philosophy. The Li Trigram is characterized by its three unbroken lines, symbolizing the continuous and upward flow of energy, which is conducive to the accumulation of wealth.

The Li Trigram is often placed in the southeast sector of the Bagua, which is considered the wealth corner in feng shui. This placement is based on the belief that the energy of the Li Trigram, when aligned with the southeast sector, can attract and enhance wealth. The southeast is associated with the element of wood, which is considered to be the most auspicious element for wealth and prosperity.

Historical and cultural data support the significance of the Li Trigram in representing wealth. In ancient Chinese texts, the Li Trigram is frequently associated with concepts of abundance, success, and material wealth. For example, the I Ching, an ancient Chinese text that serves as a foundational work for feng shui and Chinese philosophy, describes the Li Trigram as being "the image of heaven, which is above, and the image of the earth, which is below, and the image of the great, which is in the middle." This description implies a harmonious balance between the heavens, the earth, and the human realm, which is conducive to the accumulation of wealth.

Furthermore, the Li Trigram is often depicted in art and architecture as a symbol of wealth and prosperity. For instance, in traditional Chinese art, the Li Trigram is frequently used in paintings and sculptures to represent wealth and success. Similarly, in traditional Chinese architecture, the Li Trigram is often incorporated into the design of buildings, particularly in the southeast sector, to attract positive energy and promote wealth.

In conclusion, the Li Trigram is the trigram that represents the wealth position in the Bagua. This association is rooted in traditional Chinese philosophy and is supported by historical and cultural data. The placement of the Li Trigram in the southeast sector of the Bagua is considered to be particularly auspicious for attracting wealth and prosperity.