Signs / Semiotics

This semiotic is an ICON because it looks like what it represents- this no-smoking sign looks like it is forbidding smoking because of the red line across the cigarette.

This is a SYMBOL because it needs to be culturally learned. Symbols do not look like what they represent. All punctuation is symbolic as it needs to be culturally learned.

Smoke is an INDEX because it is suggestive and connected to what it represents e.g. smoke implies fire, gold implies wealth etc. Most body language is indexical.