* Simple meaning: The dove is a symbol of peace.
* Figurative meaning: Her smile was a symbol of her happiness.
* Specific use: The dollar sign ($) is a symbol for the US currency.
* Contextual meaning: The ring on her finger was a symbol of her commitment to her husband.
* Metaphorical meaning: The dark clouds were a symbol of the impending storm.
The specific meaning of "symbol" will depend on the context of the sentence.