U00000001

U00000001 is an example identifier used in documentation, data inventories, and software demonstrations to illustrate fixed-width alphanumeric IDs. The format consists of the letter U followed by eight decimal digits, for a total length of nine characters. The leading zeros ensure uniform width and enable straightforward lexical ordering in lists and databases.

In practice, U00000001 commonly appears as the first entry in a sequence designed to demonstrate indexing, searching, serialization, or API requests. It is not assigned to a real-world object unless specified by a particular data model, in which case its exact meaning would be defined in project documentation.

Important distinction: U00000001 in this context is unrelated to Unicode code point notation, which uses the form U+XXXX to denote characters. The internal identifier U00000001 is a key or token used by a system to reference a record, asset, or entity, rather than a character encoding.

Variants such as U00000002, U00000003, and so on form a contiguous sequence for examples or mock catalogs. In actual implementations, such identifiers are typically mapped to metadata stored in a database, and their semantics depend on the specific application, not on the numeric value of the id itself.