1.1 ,This practice (Note 1) covers a unified numbering system (UNS) for metals and alloys that have a “,commercial standing”, (see Note 2), and covers the procedure by which such numbers are assigned. Section 2 describes the system of alphanumeric designations or “,numbers”, established for each family of metals and alloys. Section 3 outlines the organization established for administering the system. Section 5 describes the procedure for requesting number assignment to metals and alloys for which UNS numbers have not previously been assigned.