During the opening credits, while the mysterious symbols are on screen, a rumbling drone and buzzing of a console can faintly be heard. This is the sound of the bunker control room/note room from later in the film, heard here charging up for attempt #112 that we're about to witness.
The symbols are seen again at the beginning of the closing credits, this time their missing parts fill in revealing the film's title. The two halves of this title design are a reference to the two overlapping realities witnessed in the film, one real and one ephemeral.