HSN Code 8310 refers to "Sign-plates, nameplates, address-plates and similar plates, numbers, letters and other symbols, of base metal, incl. traffic signs (excluding those of heading 9405, type and the like, and signal boards, signal discs and signal arms for traffic of heading 8608)." This classification code is essential for identifying signage and related items for import/export purposes based on their nature, composition, and intended use. Common products under HSN Code 8310 include traffic signs, nameplates, address plates, and various symbols made of base metal. Additionally, the GST rate for sign-plates and similar items under this code supports accurate trade compliance.