The flag of Timor-Leste is red, with a black isosceles triangle (based on the hoist side) superimposed on a slightly longer yellow arrowhead that extends to the centre of the flag; a white star is in the centre of the black triangle. 
East Timor adopted its flag in 1975 when gained independence from Portugal and re-adopted in 2002 when gained independence from Indonesia.
The yellow stands for the traces of colonialism.
The black stands for the obscurantism that needs to be overcome.
The red stands for the struggle for national liberation.