Disable List Deletion sharepoint 2010

If you don’t want users to be able to delete a specific SharePoint 2010 list, you can disable list deletion using Windows PowerShell. The example below demonstrates how to disable deletion of the tasks list on a Web site:

PS > $spWeb = Get-SPWeb http://SP01.powershell.nu

PS > $spList = $spWeb.Lists["Tasks"]

PS > $spList.AllowDeletion = $false

PS > $spList.Update()

PS > $spWeb.Dispose()

source:-secretsofsharepoint.com