REDUCED SPACE SYMBOL (RSS) — Composite code The principle use of the RSS family of symbologies is to identify items that could not be marked with current linear symbols because of size restrictions. It is to be used with UCC/EAN and can be stacked in two rows. The Composite Symbols family will provide additional supply chain data while allowing for the coexistence of symbologies already being used. It is composed of one of the EAN/UCC linear symbologies and one of the 2D symbologies.