British Prime Minister David Cameron adopted the term "Daesh" to refer to the Islamic State group today and asked others to follow suit to avoid lending the jihadists credibility.

Cameron had previously used "ISIL" to refer to the extremist group, which is also known as "ISIS", before switching to Daesh, which has negative connotations and is based on an Arabic acronym.

"Daesh is clearly an improvement and I think it's important that we all try to use this language," Cameron told parliament during a debate on whether Britain should join air strikes against the group in Syria.