Search notes:

Microsoft.PowerShell.Commands (namespace)

Among others, the Microsoft.PowerShell.Commands] namespace contains the classes that contain the functionality of cmdLets:

PS C:\> $cmdLetMetaData = new-object System.Management.Automation.CommandMetadata(get-command select-object)
PS C:\> $cmdLetMetaData.CommandType.FullName
Microsoft.PowerShell.Commands.SelectObjectCommand

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