symbol is a topic covered in the Taber's Medical Dictionary.

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[Gr. symbolon, a sign]

1. An object or sign that represents an idea or quality by association, resemblance, or convention.
2. In psychoanalytical theory, an object used as an unconscious substitute that is not connected consciously with the libido, but into which the libido is concentrated.
3. A mark or letter representing an atom or an element in chemistry.

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