865 is an ETOPS jet. You should see ETOPS on the fuselage.
Presumably a very recent addition, then, which would explain the absence of any photos showing on the 'Net showing the markings.
It's aligned vertically with the forward edge of the nose landing gear door.
So very close to the maximum towbar angle markings?
Easy enough to see from 5' away.
Though not easy enough to detect its absence on the walkaround for the flight in question.