I think it is something related to Team Foundation Service, but what does that mean ?
The padlock symbol means the web page you are visiting is secure. For extra peace of mind please ensure that the web address that appears in the internet bar starts with "https://", as this confirms you are on a secure web page.
That means that the file is not editable by Visual Studio; usually it comes up when you ask VS to navigate to a definition that exists only in metadata. It will display what data it can, but show a padlock to indicate that you can't edit it.
The lock means that the item is checked in, and the + means that an add operation is pending for the item.
You can see the full list of TFS Icons on MSDN.
A plus means the item has not yet been added to source control.
A padlock means the item is in source control but has not been checked out for editing
A check mark (which you don't show) means the item is in source control but has been checked out for editing.
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