kū lóu tóu
a death's-head; depiction of a dead person's skull
骷
kū
used in 骷髏|骷髅[ku1 lou2]
髅
lóu
used in 髑髏|髑髅[du2 lou2] and 骷髏|骷髅[ku1 lou2]
头
tóu
head
