Example
Consider a large, heavy oak door with ornate brass hardware on a government building:
- Index: The heavy wear on the brass handle is an index of how many people have pulled it open.
- Icon: The handle itself might be shaped like a hand, an icon telling you where to grab it.
- Symbol: The sheer size, weight, and expensive material of the door act as a symbol of the authority, permanence, and power of the government institution inside.