Symbol : Arbitrary sound, mark
or gesture - all usually capable of being easily repeated or copied - that
represents something by human
Note that symbols are considerably more
sophisticated than signs, and that quite a few
non-human animals are quite capable of understanding signs, but all
non-human animals find it hard or impossible to understand symbols.
Part of the difficulty is that symbols depend on convention, and as a
rule have nothing in common with whatever they
mean, and another part of the difficulty
is that symbols may stand for mere ideas,
fantasies, or even impossibilities, and
thus require that whoever understands the symbol is aware that it may
refer to what someone thinks or feels
or what is thought or felt about, or both.