Equity
Equity (Common stock / Ordinary shares) are common shares that grant voting rights and entitle the holder to dividends and assets after creditors.
Preferred stock / Preference shares are preferred shares with a guaranteed fixed dividend, but without voting rights.
Voting vs non-voting shares: shares with voting rights at meetings vs those without such rights (cheaper, but with no influence).
ADR (American Depositary Receipt) is an American depositary receipt for a foreign share (for example, Yandex in the USA).