Answer :
Final answer:
ASTM International uses 'W' to signify smooth wire and 'D' to signify deformed wire. These letters help to differentiate the wire types.
Explanation:
ASTM International, an organization that develops technical standards, uses specific letters to designate different types of wire. The letter 'W' is used to designate smooth wire and the letter 'D' is used to designate deformed wire. These designations help to clearly differentiate between the two types of wires, as their characteristics and applications can differ significantly.
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