What's the difference between Signs and Symbols?

Sign
Something that stands for something else.

Glyph
A graphical representation of a character or part of a character in a font. A carved figure or character.

Symbol
Something that represents something else by association, resemblance, or convention. Something visible representing something invisible. A symbol can be embued with rich layers of meanings.

Icon
An idol. An image or representation. A religious image in the eastern church. A small clickable image representing files or programs in a computer.

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