Vairocana , aka Bi ru zhe na ,is the Dharmadhatu emanation of Buddha Sakyamuni (correct me if i am wrong ,posting at this time )
the main school of practice is the True Word School or the Zhen yan zong
aka Eastern Esoteric Buddhism of Japan
it is very popular practice during the tang dynasty
the main difference of zhen yan (shingon ) and tibetan is zhen yan do not require dakini practice , more on mantra chanting and visualisation
here is a revered picture of Mahavairocana


the mantra of Vairocana
<>