Dhammakaya originates from the ancient language of Pali. The term "Dhamma" holds various meanings such as truth, nature, and spiritual knowledge. "Kaya" translates to body. In essence, Dhammakaya signifies the true essence within oneself. You might wonder about the nature of this essence, but complete comprehension can only be attained through practice. In a nutshell, the happiness derived from the physical body is limited and requires intense conditions for attainment, whereas the inner body's happiness is not constrained. The inner body only requires stillness to access this happiness.
Dhammakaya is distinguished from others primarily by its unique focal point during meditation. It is often referred to as the middle way because the core of Dhammakaya meditation lies in the "center of the body," which Luang Pu Sodh describes as a point two finger-widths above the navel of each individual. This center has also been elucidated as the "end of the breath," the focal point in the abdomen where the breath naturally converges. According to the Dhammakaya tradition, the mind can attain heightened insights only through this center, which is believed to house the Dhammakaya, the embodiment of the Dhamma.
One can visualize any object at this spot.
Why center? The middle part often holds the highest stability and strength in various aspects, including the body. Luang Pu Sodh further emphasized that this particular point serves as the epicenter of our consciousness. In Thailand, the act of breathing is referred to as "Lom Hai Chai," which can be translated as the "wind that dissapear to the mind."