Symbols VS Sign

(1) A Sign is anything that represents something
else directly. Think of traffic signs or the male
and female signs
on restrooms or the + and = sign in a mathematical equation. These signs all
have a literal meaning. The = sign means 'equals' no more and no less.

(2) A symbol has no definition
at all but many levels of meaning. It represents a concept or idea,
a feeling or emotion which is initially difficult to order or grasp
intellectually. Symbols include works of art, mythologies, plays,
literature, images and dreams which defy any simple description
of all their nuances. (if you can define it precisely, it may have
changed from a symbol to a sign).
See http://www.designboom.com/history/cross_symbol.html
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