Powershell Code

Hi All,

I am trying to understand this line of code

function ScreenPassword($instance)  
{  
    if (!($instance.screensaversecure)) {return $instance.name}   
    <additional statements>  
}  

foreach ($a in @(get-wmiobject win32_desktop)) { ScreenPassword($a) }

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what is the function of the @ symbol in @(get-wmiobject win32_desktop) ??

thank you in advance