The Icona Subdivision System defines how avatars are broken down into named groups of parts, for example head, body, and accessories. Each group contains multiple options that can be combined independently. World creators use the system to specify which subdivisions are supported in their environment, giving them control over what combinations are valid. The system integrates with Unreal Engine Blueprints and serves as the structural foundation for the broader Icona Avatar System, enabling consistent avatar assembly across different virtual worlds.