! (logical negation), used in conditional expressions != (logical inequality), used in conditional expressions && (logical AND), used in conditional expressions <Emphasis>Malicious Mobile Code<Default Para Font> * (asterisk), special notation for specifying types/classes/permissions - (minus sign), special notation for specifying types/classes/permissions == (logical equality), used in conditional expressions ^ (logical exclusive OR), used in conditional expressions (logical OR), used in conditional expressions ~ (tilde), special notation for specifying types/classes/permissions 0-day vulnerabilities and patch cycles