The word collo designates a commercial unit. Collo comes from the Italian "collo" (for freight or baggage) or the French "colis" (parcel or freight or baggage).
In English we speak of a "Trading Unit". Collo (plural colli) is the smallest unit of a consignment. Usually this consignment consists of completely different pieces, which differ greatly in shape and size.
A collo can therefore also be goods such as an aircraft turbine. The transport market continues to differentiate, so that a consignment is also called a collo if it does not completely exhaust the transport capacity of the means of transport (or vehicle) used and is therefore not transported alone.