A, B, and C shares are different classes of a company's shares. Each class has different characteristics, for example on rights to vote at shareholders' meetings. Typically different classes of stock are created if the original owner of a company wishes to raise a large amount of capital but retain majority voting rights. There is no standard naming procedure. The shares with the enhanced voting rights could be called either A or B, for example. This means investors need to read the company's prospectus to check.