I have no idea what I'm looking at. Can someone pop the hood on this for me and tell me what this is?

Take a look at the code below:

require '../common/common.php';
@$level = 'Region';
@$market = 'South Regions';
@$type = 'Stacked';

@$kpi1 = 'rrc_setup_failure_pcnt';
@$kpi2 = 'bearer_drop_pcnt';

@$mkt2 =  $_GET['mkt'];
@$mktid = substr($mkt,0,3);
@$kpi1c = $_GET['kpi1c'];
@$kpi2c = $_GET['kpi2c'];
@$profile = $_GET['profile'];
//echo 'Level: '.$level.' Market: ' . $market.' Type: '.$type.' KPI1: '.$kpi1.' KPI2: '.$kpi2;

if ($market == '' && $mkt2 <> ''){ $market = $mkt2;}



if ($kpi1c == '') {
$my_array = array('#0000ff','#0000ff','#006600','#0066cc','#9600ff','#0b6693','#f0145a','#1c5252','#ad3d3d','#2de50e');
shuffle($my_array);
$kpi1c = $my_array[3];
$c1= substr($kpi1c,1,6);
//echo ' kpi1c ' . $kpi1c . '<br>';
}
else {@$kpi1c = '#'. $_GET['kpi1c'];$c1= substr($kpi1c,1,6);}

if ($kpi2c == '') {
$my_array = array('#0000ff','#0000ff','#006600','#0066cc','#9600ff','#0b6693','#f0145a','#1c5252','#ad3d3d','#2de50e');
shuffle($my_array);
$kpi2c = $my_array[7];
$c2= substr($kpi2c,1,6);
//echo ' kpi2c ' . $kpi2c . '<br>';
}
else {$kpi2c = '#'. $_GET['kpi2c'];$c2= substr($kpi2c,1,6);}

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First thing: what is "@$level='Region'"? Not to sound like one who is totally clueless, but what's the significance of the "@" sign?

The rest is, from what I can tell, some design data that's used with some Javascript charts later in the page. But I want to know what the "@" sign is. I've seen that with session variables, but I've never taken the time to pop the hood and understand what that is.

A little help...?