An example of a symbol is a. All of these are correct.
In the field of English linguistics, a symbol can be described as a sign of something.
For example, Fall is considered as a symbol of growing old because it is during the fall season that the leaves on the trees grow old and fall down.
Water is considered as a symbol of rebirth in various cultures and religions.
Although this is a superstitious belief, but the color black is considered to be an evil sign in many cultures.
Hence, all of the above options are correct.
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