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natural symbols
objects and occurrences from nature to symbolize ideas commonly associated with them (dawn symbolizing hope or a new beginning, a rose symbolizing love, a tree symbolizing knowledge).
conventional symbols
those that have been invested with meaning by a group (religious symbols such as a cross or Star of David; national symbols, such as a flag or an eagle; or group symbols, such as a skull and crossbones for pirates or the scale of justice for lawyers)
literary symbols
sometimes also conventional in the sense that they are found in a variety of works and are more generally recognized. However, a work’s symbols may be more complicated, as is the jungle in Heart of Darkness. On the AP exam, try to determine what abstraction an object is a symbol for and to what extent it is successful in representing that abstraction.