ISIS — Islamic State of Iraq and Syria. ISIL — Islamic State of Iraq and the Levant. IS — Islamic State.
All of these acronyms refer to the same group.
Various outlets use the acronyms.
But "Daesh" is rarely used in Western media. It's an acronym for the group's full Arabic name: Al-Dawla Al-Islamiya fi al-Iraq wa al-Sham.
U.S. officials have started using "Daesh" more frequently in recent months.
"We're going to defeat Daesh," Defense Secretary Ash Carter told troops in Baghdad in July. "I don't have any doubt about it."
"To self-radicalized fighters living among us, their minds poisoned by Daesh's propaganda," U.S. Secretary of State John Kerry said during a press conference following the terrorist attacks in France.
There are two likely reasons.
First, some believe putting the words "Islamic" and "State" together legitimizes the group — something the White House has tried to avoid.
"And ISIL is certainly not a state," President Barack Obama said in September 2014.
Second, "Daesh" also has pejorative connotations in Arabic. It reportedly sounds silly and connotes barbarism, which explains why the group has reportedly threatened to cut out the tongues of anyone it catches using the word.