Custom Record Types Associated with a Custom Segment
On the Record Types list page, the custom segment name in the Segment column means that the custom record type is associated with a custom segment.

The custom record has the same name as the custom segment.

When editing a custom record that's associated with a custom segment, keep the following in mind:
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Some of the fields on the Custom Record Types page are read-only to avoid conflict with the custom segment settings.
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Some of the subtabs on the Custom Record Types page aren't available because the record is associated with the custom segment.
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You can't edit the permissions of the custom record. The custom record permissions are set on the custom segment definition page.
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You can't inactivate the custom record type because it's associated with a custom segment.
When you add a new field to the record, it appears as a column on the Values subtab of the custom segment definition page.

