The French national flag
The photo: The national flag of France is a tricolour flag featuring three vertical bands coloured blue (hoist side), white, and red. It is known to English speakers as the French Tricolour or simply the Tricolour (French: Tricolore). This version of the tricolour was brought back into use after the July Revolution and has been used ever since 1830. From Wikipedia. The entire article can be read Here
This post: Is to express great sadness and show solidarity with the French nation and its people after the series of terrorist attacks on Friday November 6, 2015 in Paris that left 129 people dead and hundreds more injured.