French graphic designer Jean Jullien created the image, "Peace for Paris", and posted it on Twitter and Instagram at midnight after the attacks.
Peace for Paris pic.twitter.com/ryf6XB2d80— jean jullien (@jean_jullien) November 13, 2015
It has been embraced by the world as the symbol to show solidarity with the City of Light and has been printed on t-shirts, posters and flags, and been shared across social mediaalong with the hashtags #PrayforParis and #jesuisparis.
Meanwhile people on Facebook have been putting the tricolor flag across their profile photos in support of Paris.
The social media platform allows you to add the filter by clicking the “try it” button when you come across a friend who has already done it.
Isobel Bowdery penned a poignant account of the attack at the Bataclan. Photo: Isobel Bowdery / Facebook
But as the #prayforparis hashtag went global, there was the inevitable backlash.
A cartoonist from Charlie Hebdo argued:
Several companies began marketing t-shirts emblazoned with the phrase Pray for Paris, some purporting to offer a percentage of the sales to victims of the attacks.
But some took to social media to urge a boycott arguing that profiteers had seized on a way to benefit in the aftermath of the attacks which claimed more than 120 lives.
Instead, why not just pen your own phrase on a plain T-shirt?