According to the heraldic symbolism of the city:
- a polyhedron - a stone cut from gold, whose faces are made in the form of five-pointed stars, is a symbol of the memory of the founders of the city and the cosmodrome;
- waving a truncated pennant - a stylized image of the northern lights;
- silver four-pointed star indicates the high-latitude location of the city of Mirny;
- a golden arrow - a stylized image of an airplane - the initial meaning of the city is the cosmodrome.
The town of Mirny owes its birth and education (1958) to the military cosmodrome Plesetsk.
For many years, both the cosmodrome and Mirny itself were hidden by a deaf veil of secrecy. The first publications about the cosmodrome and the city appeared in the central press only in 1983.
In residential areas of the city 7 square. In one of them is a monument to the founders of the garrison and the city in the form of a polyhedron - the Great Dodecahedron.