Symbols

They have no resemblance to the real object, it’s a result of a convention. A symbol can only make meaning if the person already knows that, so, this is a matter of culture and previous knowledge. We all know that a dove represents peace, but there’s no connection between the animal and peace, it’s just a convention. Letters and words are examples of symbols. The graph sign (words) has no direct link to the thing itself, but for each culture, they make meaning. For us, the mourning is represented by the color black, but this color changes for different countries and cultures.