when alphabet stock is issued typical nomenclature is to see a period and letter behind the existing stock symbol indicating a separate share class so for example if abc company whose stock symbol is abc issued class a and b shares the new ticker for these shares would be abc a and abc b respectively 
there is no standard format for alphabet stock in terms of which share class has more voting rights if voting rights differ among them typically class a shares would have more rights than class b and so forth but it is important to read the details about share classes before investing to learn more about the issuance of multiple share classes by a firm check out related writing on the topic 