db211328__Guide___Salesforce_Developers__Details
[Field] DeveloperName [Details] 
Type string Properties Create, Defaulted on create, Filter, Group, Sort, Update Description The unique name of the object in the API. This name can contain only underscores and alphanumeric characters, and must be unique in your organization. It must begin with a letter, not include spaces, not end with an underscore, and not contain two consecutive underscores. In managed packages, this field prevents naming conflicts on package installations. With this field, a developer can change the object’s name in a managed package and the changes are reflected in a subscriber’s organization. Corresponds to Rule Name in the user interface. This field is available in API version 24.0 and later. Note When creating large sets of data, always specify a unique DeveloperName for each record. If no DeveloperName is specified, performance may slow while Salesforce generates one for each record.
CaseOwnerSharingRule | SOAP API Developer's Guide | Salesforce Developers