Wafer - Is a very thin stamped bullion bar also known as a biscuit.

Warehouse Receipt - Is a document that provides proof of ownership of commodities such as bars of gold or silver that are stored in a warehouse, vault, or depository for safekeeping. Warehouse receipts may be negotiable or non-negotiable.

White Gold - Primarily used in the jewelry industry, it is an alloy containing an agent to whiten the gold such as silver, platinum, palladium or nickel.