In the battle between ISIS and ISIL, ISIS has apparently won.

President Obama and his administration most often referred to the Islamic terrorist group as "ISIL," an acronym based its self-proclaimed name, "Islamic State in Iraq and the Levant," levant referring to an area of the Middle East to the east of the Mediterranean Sea.

But the new president has a clear preference for ISIS. He has consistently called the group ISIS, as he did in 2015 when he famously vowed to "bomb the shit out of 'em."

President Trump didn't mention ISIS by name in his inaugural address, but one day later at the CIA, he again went with ISIS.

"We have to get rid of ISIS. We have to get rid of ISIS. We have no choice," he told the audience of spies and intelligence operatives.

ISIS stands for Islamic State in Iraq and Syria, which is basically where most of terrorist and their leaders are.

At his confirmation hearing this month, Defense Secretary James Mattis also referred to the terrorists as ISIS, as did White House press secretary Sean Spicer in his first Q&A with reporters Monday.

Secretary of State-designate Rex Tillerson said during his confirmation hearing that "eliminating ISIS" will be "our foremost priority in the Middle East." And CIA Director Mike Pompeo's opening statement to senators this month said "Russia has reasserted itself aggressively, invading and occupying Ukraine, threatening Europe, and doing nearly nothing to aid in the destruction of ISIS."

For a time the Obama administration also tried for a time to get everyone to call the group "Daesh," which short for the Arabic acronym for ISIS, and has a slightly derogatory double meaning, but it never really caught on.

So on the White House website and the president's pronouncements, it's ISIS the U.S. has vowed to defeat and destroy.

ISIL, it seems, is already gone.