Symbol is simply put a concrete object which represent an idea or meaning. Road signs uses shapes, colors and forms to communicate set rules with the drivers easily. It is also used on maps where symbols indicate a category of interest. Religions make symbols and icons to visually represent their identity.
An icon is an image, picture or representation that stands for an object. Icon also takes stance of symbolism where name, face, or a person who has a certain quality or well known significance represent something greater, like religion, political or econimic beliefs.
Sign is an entity that represents another entity. It signifies meanings and other subjects. Types of signs include medical sign, mathematics, information, traffic sign, linguistics,and astrology.
Logo is a graphical element that uses icon, sign and symbol with the logotype- it is intended for the people to recognize their product or company fast, and build trust and interest.
source: http://en.wikipedia.org
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