Non-diegetic

Sound coming from outside of the picture. The source of the sound is not seen in the picture, like, for example, the shot heard in Joona Tena's "Saattajat".

Cf. Sound designer, Diegetic

Joona Tena [Joona Tena • Director - Cineuropa]

Studio Binder [What is Non-Diegetic Sound? Definition and Examples (studiobinder.com)]