[plg94]

The headstone (https://de.wikipedia.org/wiki/Carl_Friedrich_Gau%C3%9F#/medi...) does not (it does feature the star of David, but I couldn't find any notion that Gauß was jewish).

But there's a statue with that star (https://de.wikipedia.org/wiki/Carl_Friedrich_Gau%C3%9F#/medi...)

[ralfd]

Gauß wasn’t jewish and it was a Christian cemetery. The gravestone insinuates the form of a cross and the David star just symbolizes the Old Testament.

[smcin]

FYI Gauss's grave is in Albani cemetery, 37085 Göttingen, Germany. https://en.wikipedia.org/wiki/Albanifriedhof

But per below comments, the star is on the monument in Brunswick/Braunschweig, not on his headstone.