The Supreme Mahayana Truth in Chinese / Japanese...

大乘無上法 means the supreme Mahāyāna truth.

This refers to the ultimate reality in contrast with the temporary and apparent. Other translations include “the reliance on the power of the vow of the bodhisattva” or “the peerless great vehicle teaching.”

Note: This may suggest that Mahayana Buddhism, as practiced in China, Japan, Korea, Vietnam, and other regions is superior (with subtle arrogance) to the original Theravada (or old school) Buddhism. Mahayana and Theravada Buddhists generally get along better than Catholics and Protestants, but there have been schisms.