What does the red symbol on the tyre indicate?

You answered correctly. The red symbol shown—a snowflake inside a mountain (3PMSF: Three Peak Mountain Snowflake)—indicates that the tyre is certified for use in wintry weather conditions and assists driving performance in snowy conditions. This marking means the tyre has passed specific tests for winter use, meeting the required safety and performance standards. It does not mean the tyre must be used only with snow chains, so any answer suggesting that is incorrect. In Germany, tyres with this symbol are required during winter driving conditions for safety. Remember: look for this symbol to ensure your tyres are suitable for snow and winter weather.