The horseman in armor and cloak, spearing a golden dragon, is an image of St. George.
In accordance with heraldic agreements, the arms depicts not a dragon, but a serpent. In heraldry, the serpent is a negative character, and the dragon – positive. You can distinguish them by the number the pads: a dragon has two, a serpent – four.
Officially, the arms of Moscow was restored only in 1993.
The new design of the emblem, which is used today, is a dark red shield with the image of the rider – St. George – in silver armor and a blue mantle (cloak), on a silver horse, striking a black serpent with a golden spear.
There is a spread misconception, that the arms of the city of Moscow is an element of the modern State Emblem of the Russian Federation. But the rider of the State Emblem is not St. George, and differs from that of the arms of Moscow. Unlike the rider of the State Emblem, St. George has a spear tip in the form of a cross.
On the State Emblem the horse stands on three legs, with one front leg raised, while the horse of the Moscow rider gallops and is based on two hind legs. The serpent on the State Emblem lies on its back, being overturned and trampled by the horse. The serpent on the arms of Moscow stands on its four pads and turns back.