•2: something that stands for or suggests something else by reason of relationship, association, convention, or accidental resemblance; especially: a visible sign of something invisible <the lion is a symbol of courage>
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•5: an act, sound, or object having cultural significance and the capacity to excite or objectify a response
What is a symbol?
Within the context of Masonry, definitions 2 and 5 are most applicable.  A symbol is something that we can all see, hear, feel or otherwise sense that serves to remind us of something more personal within ourselves, and about which we may have stronger feelings.