Sì, è un array. Esempio:
Codice HTML:
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>test</title>
</head>
<body>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
function test()
{
var scelta = $('input:checked');
document.getElementById('output').innerHTML = '';
for(var i=0;i<scelta.length;i++)
document.getElementById('output').innerHTML += scelta[i].name+" ";
}</script>
<form>
<script type="text/javascript">
var array = new Array('primo', 'secondo', 'terzo', 'quarto', 'quinto');
for(var i=0;i<array.length;i++)
document.write('<input type="checkbox" name="'+array[i]+'" vaue="'+array[i]+'"> '+array[i]+' <br>');
</script>
</form>
<button onclick="test()">vai</button>
<p id="output"></p>
</body>
</html>
Ciao!