# Item-ID

An item-ID is a unique identifier by which an item can
be retrieved from a file. An item-ID may be any length up to 100 characters.
It can be made up of any characters except the system delimiters;
sm, am, vm, svm, or sb, and any character with an ASCII value 247
or greater. If any of these reserved values are used in an item-ID,
the item-ID will be truncated at the first use of such a character.
It is recommended that characters with ASCII values greater than 127
not be used since they may not display or show as different symbols
on different display or printing devices.

## See also

- [compile-catalog command](https://d3codex.com/tcl/compile-catalog-command/)
- [exchange command](https://d3codex.com/tcl/exchange-command/)
- [File-defining items](https://d3codex.com/definitions/file-defining-items/)
- [Modulo](https://d3codex.com/definitions/modulo-glossary/)

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Source: https://d3codex.com/definitions/item-id-glossary/ - part of the D3Codex reference.