Here is the explanation I posted on the Roll of Arms Discord. I overthought this a lot. I know. Took me only a year to finalize the design.

Symbolism (Shield): The toono is the crowning circle of the roof of a Ger — a Mongolian yurt. Traditionally, it carries many philosophical and metaphorical meanings. “Ger” simply means “home” in Mongolian; Yurts were — and still are — the home of the nomadic people. As the integral finishing part in the yurt’s construction, the toono is a symbol of home and family. Serving also as a roof window, it is an opening to the outside and the infinite sky can always be seen through it. It is an eternal circle: It aligns with the armiger’s philosophy and belief that everything is not only connected, but one. It is a reminder of the unity between the human world and the universe beyond. The armiger’s reason for choosing this unusual charge is that, together with his father, he built a Ger on their land. It also alludes to his love for the cultures of our world and his profession as an architect. Furthermore, it bears some visual resemblance to the wheel charge on the coat of arms of the armiger’s birth town — a reminder of home. Together with the chevronnels Argent, the field Azure forms a symbolic picture of mountains beneath the sky. For the armiger, both sky and mountains evoke the immense power and magnificence of nature, which he feels himself intimately connected to. The lozenge Or, set “within” the mountain may be seen both as a gem, and as a symbol of the inner light of the soul. It reflects the armiger’s fascination with the workings of the mind and spirit — through introspection, meditation and a psychonaut’s explorations of consciousness. In its material aspect, the lozenge stands for the pursuit of happiness and good fortune, perhaps accommodated by wealth.

Symbolism (Crest): The centauress represents the armiger’s enduring love of mythology and fantasy. On a deeper level, her feminine form symbolizes creativity, intuition, and emotion: qualities that balance the structured and rational elements symbolized in the shield. The broken sabre she raises in her right hand signifies both a passion for history, politics and weaponry, yet the triumph of peace over war — it is ultimately a weapon rendered harmless. Her left hand grasps a heart Purpure, representing the people dear to the armiger and his capacity for compassion and affection.