# Segment mark

A segment mark is the specific metacharacter used within
D3 items. The segment mark is not actually part of data. Rather, it
is used as an item delimiter, and is automatically appended to the
end of an item when written to disk.

The segment mark is a reserved character. This means that
it cannot be used for any other purpose.

The following table
shows the different representations for the segment mark:

| ASCII value | _ |
| --- | --- |
| Hexadecimal value | ff |
| Decimal value | 255 |

## See also

- [Attribute mark](https://d3codex.com/definitions/attribute-mark/)
- [Delimiter](https://d3codex.com/definitions/delimiter/)
- [dump command](https://d3codex.com/tcl/dump-command/)
- [Metacharacters](https://d3codex.com/definitions/metacharacters/)
- [Start buffer mark](https://d3codex.com/definitions/start-buffer-mark/)
- [Subvalue mark](https://d3codex.com/definitions/subvalue-mark/)
- [System delimiters](https://d3codex.com/definitions/system-delimiters/)
- [Value mark](https://d3codex.com/definitions/value-mark/)

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Source: https://d3codex.com/definitions/segment-mark/ - part of the D3Codex reference.