"Tenet" is a reference to the final battle, the "10-minute assault." And, as you can see, it's actually the word "ten" both forwards and backwards. In the battle, we see Robert Pattinson's Neil ...

Neil asks. Kat frowns in classic Nolan-wife fashion ... Perhaps I’m the most galaxy-brained of all the Tenet explainer types, because I don’t need a theory to justify the silliness of Debicki ...

who worked together on the cerebral thriller Tenet. Pattinson brought his offbeat charm and mystery to the role of Neil, a secretive agent with critical ties to the films time-bending plot.

When Neil saves the protagonist in the concert hall ... a sound designer who worked on "Dunkirk," told Variety at the time of the "Tenet" release that the sound in a Nolan movie is like almost ...

The Protagonist discovers this through a secret mission, so the ClA assigns Agent Neil to help the Protagonist discover the mystery behind the bomb activated from the future and explodes in the past.