The Russian Orthodox cross.

Russian Cross refers to a demographic trend in Russia.The Orthodox cross (also known as Crux Orthodoxa, the Byzantine cross, the Eastern cross, and the "Russian" cross) can be considered a modified version of the Patriarchal cross, having two smaller crossbeams, one at the top and one near the bottom, in addition to the longer crossbeam. The lower crossbeam represents the footrest (suppendaneum) to which the feet of Jesus were nailed. In most earlier representations (and still currently in the Greek Church) the crossbar near the bottom is straight. In later Russian and other traditions, it came to be depicted as slanted, with the side to the viewer's left usually being higher. One tradition says that this comes from the idea that as Jesus took his last breath, the bar his feet were nailed to broke, thus slanting to the side. It is also said that the slanted bar represents the repentant thief and the unrepentant thief that were crucified with Christ, the one to Jesus' right hand repenting and rising to be with God, and one on his left falling to Hell and separation from God. In this manner it also reminds the viewer of the Last Judgement. Another explanation of the slanted crossbar would suggest the Cross Saltire, as tradition holds that the Apostle St. Andrew introduced Christianity to lands north and west of the Black Sea: today's Romania, Moldova, Belarus, Russia, and Ukraine.
i do not seriously understand the essence of the three bar cross. but,its their tradition.st. basils cathedral
Russian orthodox church
Russian orthodox crossit is also used to make jewelry.