TUN is a Danish product standard numbering system managed by Danish Timber & Building Merchants' Trade Organization (Trælasthandlerunionen) identifying building material

Building material

Building material is any material which is used for a construction purpose. Many naturally occurring substances, such as clay, sand, wood and rocks, even twigs and leaves have been used to construct buildings. Apart from naturally occurring materials, many man-made products are in use, some more...

s.. Currently more than 30,000 products are identified. TUN numbers are assigned to supplier

Supplier

Supplier may refer to:*Manufacturer, uses tools and labor to make things for sale*Processor , converts a product from one form to another*Packager , encloses products for distribution, storage, sale, and use...

s identifying products and therefore a product with several suppliers can have more than one TUN number. TUN numbers are currently being mapped against UNSPSC

UNSPSC

The United Nations Standard Products and Services Code is a taxonomy of products and services for use in eCommerce. It is a five-level hierarchy coded as an 8-digit number.-Governance:...

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