維基百科：通用唯一識別碼（英語：universally unique identifier，縮寫：uuid）是用於計算機體系中以識別資訊數目的乙個128位識別符號，還有相關的術語：全域性唯一識別符號（guid）。
根據標準方法生成，不依賴**機構的註冊和分配，uuid具有唯一性，這與其他大多數編號方案不同。重複uuid碼概率接近零，可以忽略不計。
uuid的標準型式包含32個16進製制數字，以連字型大小分為五段，形式為 8-4-4-4-12 的32個字元。
示例：550e8400-e29b-41d4-a716-446655440000
=lower(concatenate(dec2hex(randbetween(0,power(16,8)),8),"-",dec2hex(randbetween(0,power(16,4)),4),"-",「4」,dec2hex(randbetween(0,power(16,3)),3),"-",dec2hex(randbetween(8,11)),dec2hex(randbetween(0,power(16,3)),3),"-",dec2hex(randbetween(0,power(16,8)),8),dec2hex(randbetween(0,power(16,4)),4)))
=lower(concatenate(dec2hex(randbetween(0,power(16,8)),8),"",dec2hex(randbetween(0,power(16,4)),4),"",「4」,dec2hex(randbetween(0,power(16,3)),3),"",dec2hex(randbetween(8,11)),dec2hex(randbetween(0,power(16,3)),3),"",dec2hex(randbetween(0,power(16,8)),8),dec2hex(randbetween(0,power(16,4)),4)))
=concatenate(dec2hex(randbetween(0,power(16,8)),8),"-",dec2hex(randbetween(0,power(16,4)),4),"-",「4」,dec2hex(randbetween(0,power(16,3)),3),"-",dec2hex(randbetween(8,11)),dec2hex(randbetween(0,power(16,3)),3),"-",dec2hex(randbetween(0,power(16,8)),8),dec2hex(randbetween(0,power(16,4)),4))
=concatenate(dec2hex(randbetween(0,power(16,8)),8),"",dec2hex(randbetween(0,power(16,4)),4),"",「4」,dec2hex(randbetween(0,power(16,3)),3),"",dec2hex(randbetween(8,11)),dec2hex(randbetween(0,power(16,3)),3),"",dec2hex(randbetween(0,power(16,8)),8),dec2hex(randbetween(0,power(16,4)),4))
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