https://en.wikipedia.org/wiki/Metal_umlaut https://en.wikipedia.org/wiki/Metal_umlaut The writer presumably knows that umlauts and other non-ascii characters a

https://en.wikipedia.org/wiki/Metal_umlaut https://en.wikipedia.org/wiki/Metal_umlaut The writer presumably knows that umlauts and other non-ascii characters are functional in many languages. "rock döts" is poking fun at the trend in a certain tranche of anglophone rock/metal to use them in a purely aesthetic way in band names etc.