5 Seconds of Summer have had efforts to trademark their nickname '5SOS' scuppered.

Australian newspaper the Herald Sun report that the band's production company One Mode Productions applied to have the name trademarked.

However, Australian trademark delegate Iain Thompson turned down the request because they feel '5SOS' isn't "notorious".

He said: "The name of this group is not notorious: apart from these proceedings I have not encountered the group and it is not suggested in the declaration that the group is notorious.

“Neither does it necessarily follow that if the name of the group were notorious that that directly equates to notoriety as a trade mark."

5 Seconds of Summer are one of Australia's biggest music acts and their self-titled debut album reached No.1 in the country last year.

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Watch 5SOS in action below: