The alias of the toolbox, used when referencing a tool: name_alias.
[Visual Basic .NET] Public ReadOnly Property Alias As String
[C#] public string Alias {get;}
[C++]
HRESULT get_Alias(
BSTR* Alias
);
[C++]Parameters
Alias [out, retval] Alias is a parameter of type BSTR
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.