Unger-Hamilton explained the band's name to FMQB
: "Gwil discovered the Alt-J shortcut on his computer, which creates the 'delta' symbol, and he thought we should call our band just the delta symbol, which is a triangle in the Greek alphabet. That was kind of our band name but we chose to pronounce it Alt-J, because we knew being played on the radio, you need to really give your band a name that is spoken and not just written. So it was going to be said 'Alt-J' and written like a triangle or a delta. But now the delta symbol remains as sort of a masthead for the band."