Nearly fifteen years since Indiana Jones and the Kingdom of the Crystal Skull, and we’ve finally gotten our first glimpse of Harrison Ford back in action as Indy in the trailer for Indiana Jones and the Dial of Destiny. Also starring Phoebe Waller-Bridge, Mads Mikkelsen, and Antonio Banderas, the fifth film had already been announced and teased, but the last week’s trailer premiere marked the first proper glimpse fans got of the film – as well as its title.

In keeping with tradition – the fifth Indiana Jones film follows previous naming conventions, and has a subtitle: like Raiders of the Lost Ark, Temple of Doom, and The Last Crusade. As we learned from last week’s trailer, the subtitle for Indy five is The Dial of Destiny – a mysterious-sounding title that seems to hint at the film’s possible plot, or at least its MacGuffin. But even with a trailer’s worth of footage to dissect, the question remains – what exactly is the Dial of Destiny?