For many months now, we have heard world leaders speak of the threat posed by ISIS , IS and ISIL.
But in the wake of the devastating terror attacks in Paris on Friday, we have seen another word being used with increasing frequency.
When French president Francois Hollande addressed a nation in mourning following the tragic events, he said they were "waged by a terrorist army, a jihadist army, by Daesh, against France."
Hacker group Anonymous also included the term 'Daesh' in a tweet published yesterday in which they vowed to 'wage war' on Islamic State.
Many of us might not have heard the term 'Daesh' before - but you'll probably be hearing it much more often from now on.
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What does it mean?
Daesh is an acronym for the Arabic phrase al-Dawla al-Islamiya al-Iraq al-Sham (Islamic State of Iraq and the Levant).
Essentially, it's another word for ISIS - but apparently one that ISIS militants do not favour.
Why? Because it is similar to the Arabic words 'Daes', 'one who crushes something underfoot' and 'Dahes', translated as 'one who sows discord'.