Comment by 0xbadcafebee

Defrost is the little window icon with wavy lines on it. Same icon it's been since I started driving 25 years ago. According to the internet, it's been that way for 50 years, since it was standardized by ISO 2575-3:1975 ("Road vehicles — Symbols for controls, indicators and tell-tales"). Both US and European law decided in 1978 that everyone had to use the same icons.

And there's a user manual in the car, you know; RTFM?