The Long Hundred is a historic unit of count equal to 120 items—often symbolized as “lh” or simply “120” in old ledgers—and was traditionally used in British and European trade for commodities such as eggs, textiles, and bulk goods; unlike the modern decimal hundred, this “long” count helped merchants standardize large shipments, simplify pricing, and reduce fractional calculations, making it a practical tool for medieval and early‑modern commerce. Today, the Long Hundred remains important for historians, archivists, and researchers who decode trade records, convert legacy inventories, and study economic patterns, while its legacy influences contemporary discussions of measurement systems and the evolution of standardized units in both practical and scientific contexts.