There isn't one specific symbol that represents steampunk fashion, as it's a movement that values individuality and creativity. However, there are certain design elements that are commonly associated with the steampunk aesthetic.
Gear and cog motifs, bronze or brass accents, clock faces or watch parts, aviator goggles, top hats, corsets, lace-up boots and Victorian-inspired clothing styles are all frequent design elements found in steampunk fashion.
Airships, dirigibles, hot air balloons, and other forms of retro-futuristic transportation are also often featured in steampunk designs. Ultimately, the beauty of steampunk fashion is that it is highly customizable and can be adapted to suit individual tastes and styles while still nodding to the larger movement.