national ID card, ID number
Nuria imita su voz, tiene su DNI y hasta se ha quedado con su piso.
Nuria imitates her voice, has her ID, and has even taken over her apartment.
— Abre los ojos (1997)
Tendrá que poner sus huellas dactilares y su DNI.
You will need to provide your fingerprints and ID.
— Ángeles caídos (1995)
Nunca he logrado memorizar mi DNI.
I have never been able to memorize my ID number.