The term "FSC number" can refer to two different things depending on the context. Here are the two possible meanings:

1. FSC Certificate Codes: These are codes used to identify companies that have been certified by the Forest Stewardship Council (FSC) for sustainable forestry practices. The FSC Certificate Code is a unique six-digit number assigned to each certified company, and it can be found on invoices from FSC certified companies and on FSC labels.

2. Federal Supply Classification (FSC) Codes: These are codes used by the US government to group products into logical families for management purposes. The FSC is a four-digit code that is a commodity classification divided into homogenous groups and classes, designed to serve the functions of supply and is sufficiently comprehensive in scope to permit the classification of all items of personal property. The FSC codes are required in the acquisition, receipt, and disposal phases in the personal property lifecycle, but not the utilization phase. Many government product/service listings and future procurements are identified by FSC or Product/Service Code (PSC) .