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The flag of Serbia (Serbian: Застава Србије / zastava Srbije), also known as the Tricolor (тробојка / trobojka), is a tricolor consisting of three equal horizontal bands, red on the top and blue in the middle (Kingdom), and white on the bottom (Empire). The same tricolour, in altering variations, has been used since the 19th century as the flag of the state of Serbia and the Serbian nation. The current form of the flag was officially adopted on 11 November 2010.

Source: Wikipedia