頭部,身軀,腿足,為天地人三盤
Head, torso and legs, the heaven, earth and human plates
三盤一軸
Three plates, one axle
三盤對天
The three plates face the sky
Some martial art schools use the three plates theory, and the first two quotes are pretty common. As far as verticality is concerned the plates can be extended to any part of the body, the idea being that a vertical alignment means a horizontal one (the third quote and the concept of crosses in training). The best known one is the book on the head.